English Longitudinal Study of Ageing (ELSA) User Guide for the
Contents
1.2. IDAUNIQ Unique individual serial number IDAINDW2 W2 Individual analytical serial number IDAHHW2 W2 household analytical serial number PERID Person number in the household SAMPSTA Type of sample member i e core member core partner younger partner or new partner FINSTAT Final status of respondent after Wave 2 interview W2INDOUT Individual outcome code W2HHOUT Household outcome code COUPLE Relationship status derived from household grid CPID Person number of partner CHINHH1 Whether respondent has a child in the household CHOUTHH Whether respondent has a child outside the household GCINHH1 Whether respondent has a grandchild in the household MAINHH1 Whether the mother of the respondent is in the household PAINHH1 Whether the father of the respondent is in the household END OF DATASET CONCUR Whether interview was concurrent or not ORDCON Person number of first person interviewed concurrently WHOSO1 Anyone other than interviewer and respondent in the room 1st other person WHOSO2 Anyone other than interviewer and respondent in the room 2nd other person WHOSO3 Anyone other than interviewer and respondent in the room 3rd other person HHTOT Number of people in household computed ASKPX1 Whether interviewed by proxy FUTYPE Financial unit type INTDATM Month of Household Interview INTDATY Year of Household Interview IINTDTM Month of Individual Interview
3. Table 3 Response rates to key modules 6 246 Household 999 6 712 Financial unit 990 gt Self completion 9 307 Individual 8 688 Individual The response rate for the housing income and assets modules was very high and similar to the rates achieved in Wave 1 Response rates for the self completion module again similar to Wave 1 and nurse visit were good in survey terms Further information about weighting to address non response to the nurse visit to the self completion module and the blood sample collection is given the Wave 2 report see www ifs org uk elsa In addition non response to specific items in the interview including economic variables was very low as it had been in Wave 1 WEIGHTING The variable in the dataset to be used for weighting is W2WGT Weights were calculated for core sample members only including proxy and partial interviews as this is the sample of interest All other non sample individuals that were interviewed i e core new and younger partners have a weight of zero When running weighted analyses researchers should remember to exclude non sample members in the unweighted base if quoted The data for partners can be used as characteristics of the core members i e supplementary information Where possible we recommend that analysis be conducted on weighted data since this should help to reduce bias from non random non response The aim of weighting is to take account of any bias from
4. due to a problem with the CAPI program the wrong set of previous responses was fed forward for various questions Therefore these respondents were asked a few questions that they should not have been asked were not asked some questions that they should have been asked or were asked questions with the wrong wording i e textfills Only a small number of questions were affected by this problem This is partly because the wrong responses that were fed forward usually came from another member of the household who had often given the same answers as this person at Wave 1 The respondents who had the wrong information fed forward are identified by the variable FFPROB These respondents have also had their answers to particular questions recoded to show that their responses to these questions were affected by this problem The two special response categories that have been used are 3 Did not respond at w1 but were not asked 4 Did respond at w1 but were asked DATASET INFORMATION The core dataset has been archived for ELSA Wave 2 This lists cases at an individual level Data for ELSA respondents collected during HSE referred to as Wave 0 data and ELSA Wave 1 can be used for longitudinal analysis all of which is available from the data archive The ELSA Wave 2 core dataset contains data in the following order e Key variables not in the questionnaire e g serial number outcome codes e Variables in the questionnaire in the
5. IDAHHW1 etc It is necessary to have a different household serial number for each wave as respondents can change households between waves An index file will shortly be provided which will enable data users to link the household serial numbers in order to compare data for each respondent and household at different waves Wave specific individual serial number IDAINDW2 is the individual serial number This serial number is independent of the household serial number and the serial number used during interviewing Person number Each person within the household was given a number starting from 1 at the time of the HSE interview PERID The numbering was continued for new people that entered the household after the HSE interview This number is used for several variables For example it is used to indicate which one of the other people in the household is the respondent s partner see variable CPID or to identify the person in the household that responded to particular questions such as the Income and Assets module see variable IAPID INTERVIEW OUTCOME Individual and household level interview outcomes are given in W2INDOUT and W2HHOUT respectively The individual outcome is a two digit code The first digit indicates whether the interview was full 1 or partial 2 The second digit indicates whether the interview was in person 1 or by proxy 3 The household outcome is a three digit code The first digit indicates whether all eligi
6. would provide data that measured change over time This was achieved by repeating some measures exactly for example to measure income and assets by asking directly about change for example to capture perceived changes in memory and concentration and by adapting questions to allow people to update or amend past responses for example about work pensions and specific health conditions The Wave 2 interview was also expanded to answer a variety of additional research questions The new items included quality of health care received household spending on leisure clothing and transfers perceptions of deprivation relative to others perceptions of ageing levels of literacy perceived effort and reward for care giving and voluntary activities Core sample members who completed a main interview were also offered a nurse visit This was similar to the one that many respondents had as part of the Health Survey for England in 1998 1999 or 2001 and included tests of blood pressure lung function blood tests anthropometric measures and physical performance measures This data and accompanying documentation is also available from the archive ELSA is the result of collaboration between University College London the Institute of Fiscal Studies IFS and the National Centre for Social Research NatCen Other academic collaborators based at the Universities of Cambridge Exeter and East Anglia provided expert advice on specific modules
7. IINTDTY Year of Individual Interview INDSEX Definitive sex variable Priority Disex Dhsex INDOBYR Definitive year of birth collapsed at 90 plus Priority Didbn Dhdob INDAGER Definitive age variable collapsed at 90 plus Priority Diag Dhage W1INDOUT Wave 1 individual outcome code W1HHOUT Wave 1 household outcome code AHSECLS2 Data Archive HSE clustering variable HSEINT Whether interviewed at HSE HSEYR HSE source survey year QVER Questionnaire version FFPROB Whether had feed forward data error See user guide ASTRATIF2 HSE stratification variable first level stratification ANSSEC FROM HSE NS SEC long version AXSC2000 FROM HSE SOC2000 without dots BNSSEC From Wave 1 NS SEC BXSC2000 From Wave 1 SOC2000 without dots BHEAID1 Walking aids used reported in Wave 1 1st mention BHEAID2 Walking aids used reported in Wave 1 2nd mention BHEAID3 Walking aids used reported in Wave 1 3rd mention BHEAID4 Walking aids used reported in Wave 1 4th mention BHEAID5 Walking aids used reported in Wave 1 5th mention 25 BHEOPT1 Diagnosed eye condition reported at Wave 1 1st mention BHEOPT2 Diagnosed eye condition reported at Wave 1 2nd mention BHEOPT3 Diagnosed eye condition reported at Wave 1 3rd mention BHEOPT4 Diagnosed eye condition reported at Wave 1 4th mention BEHDIA01 Diagnosed cardiovascular condition reported at Wave 1 1st menti
8. e people who refused to answer or reported don t know on any of the CES D questions were excluded from being asked the quality of care questions SCACTA How often In the first wave of ELSA this variable was included in respondent goes to the CAPI SPCin the cinema SCACTB How often In the first wave of ELSA this variable was included in respondent eats out the CAPI SPREst of the house SCACTC How often In the first wave of ELSA this variable was included in respondent goes to the CAPI SPMus an art gallery or museum SCACTD How often In the first wave of ELSA this variable was included in respondent goes to the CAPI SPTea the theatre a concert or the opera SCMOREA Would respondent In the first wave of ELSA this variable was included in like to go to the the CAPI SPCinB cinema more often SCMOREB Whether would like In the first wave of ELSA this variable was included in to eat out of the the CAPI SPREstB house more often SCMOREC Whether would like In the first wave of ELSA this variable was included in to go to art galleries the CAPI SPMusB or museums more often SCMORED Whether would like In the first wave of ELSA this variable was included in to go to the theatre concerts or the opera more often the CAPI SPTeaB 23 APPENDIX Variables not included in the questionnaire documentation Variable name Variable label BEGINNING OF DATASET
9. non response That is non response weighting corrects for systematic differences in response rates across sub groups The equal probability design of the HSE samples and the fact that the ELSA sample included all eligible adults from the HSE eliminates any need for weights to account for selection probabilities However non response at HSE refusals to be re interviewed post HSE and non response at ELSA Waves 1 and 2 all have the potential to make the ELSA respondent sample unrepresentative of those groups less likely to respond In addition the original complex sample design of the HSE samples has to be considered The HSE sample design is described in the ELSA Wave 1 Technical Report An analysis of response at Wave 2 focussed on the 10 770 core members who responded at Wave 1 and were eligible for interview at Wave 2 Ineligible persons included the deceased and those institutionalised Of these 8 780 were successfully interviewed at Wave 2 The response analysis was applied at the individual level of analysis although a number of household level variables were included in the model Since all cases were interviewed at Wave 1 there were a large number of variables available for analysing response at Wave 2 The dependent variable was a response status indicator 1 indicating a successful interview at Wave 2 and 0 indicating non 1 If non core sample members are to be analysed they should be analysed unweighted The analysis of
10. order they appear in the CAPI interview A small number of additional variables that are associated with particular questionnaire variables are located alongside these variables in the data These are annotated in the questionnaire e Other variables not in the questionnaire including administrative variables other derived variables and variables fed forward from Wave 1 See Appendix for the full list of variables not included in the questionnaire The main group of respondents for analysis is the core members Data on partners i e core younger and new partners can be used as characteristics of the core members i e to provide supplementary information but these partners should not be analysed as individuals in their own right The ineligible partners are unrepresentative and any analysis using them would need to be unweighted SERIAL NUMBERING Constant serial numbers All the ELSA data files deposited in the archive will contain a unique individual analytical serial number IDAUNIQ to enable users to link the different files Each respondent will have a unique value for IDAUNIQ which will remain constant Wave specific household serial number The five digit household serial number IDAHHW2 was randomly generated for the archived dataset and does not relate to the serial number used during interviewing The dataset for each wave of ELSA including Wave 0 i e HSE contains a different set of household serial numbers IDAHHWO
11. start with the same two letter module prefix shown in the brackets below However there are a small number of variable names that do not follow this convention Household Demographics DH The household demographics module was answered by one person on behalf of the household It was used to collect basic demographic information about everyone living in the household The composition of the household given at Wave 1 was proactively fed forward and the interviewer checked if all the people were still present in the household and if their details were correct The ELSA program determined the eligibility for the ELSA interview for each person in the household see Sample Design section Note that information provided by the respondent to these questions is copied onto the data for other members of the household Individual Demographics DI This module is at the start of the ELSA individual interview Each respondent was asked details about their legal marital status living children including adopted foster and stepchildren number of grandchildren and great grandchildren number of siblings and their own circumstances in childhood if not answered at Wave 1 Health HE This module was administered to all respondents It covered many different dimensions self reported general health long standing illness or disability eyesight and hearing specific diagnoses and symptoms pain difficulties with activities of dail
12. that the question was NOT asked of proxy respondents The variable ASKPX1 identifies proxy interviews 92 proxy interviews were for core members 19 were for core partners 6 were for new partners and 8 were for younger partners USE OF RESPONSES FROM PREVIOUS INTERVIEWS IN THE CAPI FEED FORWARD In the ELSA Wave 2 program answers given at previous interviews i e Wave 1 or HSE were used in the routing and question wording i e textfills For example if a respondent reported that they had an eye condition e g cataract at Wave 1 they were asked particular questions at Wave 2 to find out if they still had this condition HEOPC HEOPW HEOPN HEOPS Problem with feed forward data HEDIAC For the first part of the Wave 2 fieldwork there was a problem with the variable HEDIAC which asked respondents who had reported a cardiovascular condition at Wave 1 whether they still have it at Wave 2 This question was not asked of any respondents in the first part of fieldwork Unfortunately this also had a knock on effect on many other follow up questions about cardiovascular conditions see Notes about particular variables in the data on Page 19 of the user guide The variable HEFFLAG shows which respondents reported one or more cardiovascular conditions at Wave 1 who were not asked HEDIAC due to the feed forward problem N 2532 Problem with feed forward data wrong information fed forward Furthermore in a small number of cases N 33
13. 1 the uestionnaire HEAGA Age first told had At Wave 2 these questions were asked only of the HEAGB CVD condition following HEAGC HEAGD i respondents who were not interviewed at HEAGE Wave 1 and said they had the condition at Wave 2 HEDIA01 9 i ii respondents who had the condition at Wave 1 and confirmed this at Wave 2 but did not respond to the question about at what age they were diagnosed with it at Wave 1 See below as well HEAGAR amp Month and year told At Wave 2 these questions were asked only if HEAGARY had CVD condition respondents did not have the condition at Wave 1 but HEAGCR amp in last 2 years did have it Wave 2 Use these variables in HEAGCRY conjunction with the age of diagnoses reported at HEAGDR amp Wave 1 BHEAGA BHEAGE and HEAGA HEAGE to HEAGDRY obtain the age at diagnosis for everyone reporting diagnosis up to Wave 2 HEAGBR amp Month and year told These questions were asked of everyone who HEAGBRY had CVD condition responded at HEDIAA at Wave 1 and reported a new HEAGER amp in last 2 years condition at this question at Wave 2 HEAGERY heart attack and stroke HEHRTA Questions about These questions were asked of two sets of HEHRTF quality of care respondents received for angina i those who reported having being diagnosed or heart attacks with angina or heart attack ii those who did not report diagnoses of these 21 or stroke or diabetes but showed angina symptoms in
14. Funding for the first four waves of ELSA has been provided by the US National Institute on Aging and a consortium of British Government departments specifically Department for Education and Skills Department of Environment Food and Rural Affairs Department of Work and Pensions HM Treasury HMRC formerly Inland Revenue Office of the Deputy Prime Minister and Office for National Statistics Many of the measures adopted in ELSA are comparable with measures used in the US Health Retirement Study HRS and the Survey of Health and Retirement in Europe SHARE ETHICAL CLEARANCE Ethical approval for ELSA Wave 2 was granted from the Multicentre Research and Ethics Committee MREC DEVELOPMENT AND PILOTING Two pilots of the computer assisted personal interview CAPI instrument the self completion questionnaire and associated documents were conducted in August 2003 and January 2004 All pilot respondents were drawn from households which participated in the ELSA Wave 1 pilots KC to find out The pilots tested the fieldwork procedure and interview content An approach to dependent interviewing was developed that is feeding information from a past interview into the current one SAMPLE DESIGN The ELSA sample has been designed to represent people aged 50 and over living in private households in England Three years of the Health Survey for England HSE were selected as the sampling frame 1998 1999 and 2001 These years were chosen bec
15. UK Data Archive Study Number 5050 English Longitudinal Study of Ageing English Longitudinal Study of Ageing ELSA User Guide for the Wave 2 2004 5 Core Dataset Version 2 This document accompanies the second version of the interview data from Wave 2 2004 5 of the English Longitudinal Study of Ageing ELSA The guide provides An outline of the sampling and methodology Content of the ELSA interview A description of the ELSA Wave 2 core dataset including key variables Documentation of the ELSA Wave 2 main interview CAPI questionnaire ELSA Wave 2 core self completion questionnaire Code book and edit instructions Field documents including cognitive function booklet advance letters sent to respondents etc e Interviewer instructions The following data and documentation are deposited at the UK Data Archive www esds ac uk Table 1 ELSA Wave 2 Files deposited at the UK Data Archive Title Format Wave 2 Core Data v2 Various statistical packages Wave 2 Nurse Data v2 Various statistical packages Wave 2 Financial Derived Variables DVs Data Various statistical packages Wave 2 Mortgage Data Various statistical packages Wave 2 Ryff Self Completion Data Various statistical packages Wave 2 Pension Grid Various statistical packages Wave 2 Core Data User Guides and Documentation Word available as part of PDF documentation Wave 2 Financial DVs Variable Relationships Excel Wave 2 Pension Grid Corresponding Variables Excel Retire
16. age of 1 and that the weighted total sample size equalled the unweighted Note that calibration weighting has not been performed on the Wave 2 weight One reason is that possible external sources of information for calibration e g mid year household population estimates or 2001 Census totals aged on to the mid point of Wave 2 fieldwork would have required an adjustment to exclude immigrants By definition immigrants cannot have entered the ELSA population between Waves 1 and 2 as only core members interviewed at Wave 1 were followed up for interview at Wave 2 We were advised by the Demographic Methods Centre at the Office for National Statistics that such an adjustment would have inevitably introduced some errors into the weighting Standard Errors Standard errors for survey estimates should account for the complex sample design and the weights There are two aspects of the sample design that impact on standard errors clustering and stratification Clusters can be identified with variable AHSECLS2 this is currently not in the Wave 2 dataset but is in the Wave 1 dataset The stratification can be replicated using variable ASTRATIF2 The ELSA Wave 1 Technical Report illustrates the difference between true standard errors i e those that take the design into account and uncorrected standard errors Design factors for key estimates tend to fall within the range 1 0 1 7 where values above 1 2 are commonly described as indica
17. ause they were recent and could provide a sufficiently large sample size ELSA used the core samples for these years all of which were nationally representative The HSE 1999 sample design also included a boost sample that represented ethnic minorities Because of funding constraints it was not possible to follow up the boost sample and it was discarded Together these three HSE years contained 23 132 responding households Households were removed from the HSE sampling frame for ELSA Wave 1 if it was known that there was no adult of 50 years or older in the household who had agreed to be re contacted at some time in the future Individuals in the remaining households provided the basis for the ELSA Wave 1 sample 11 578 households containing 18 813 eligible individuals The Wave 1 Technical Report provides more details Sample Types Within households there were four different types of individual who were eligible to be invited to take part in the study core sample members core partners younger partners and new partners The variable FINSTAT determines the sample type of the respondent Each type of respondent is described in Box 1 The Wave 1 interview took place in 2002 2003 and provided the baseline for the study Eligible sample members who responded at this stage were renamed core members to distinguish them as the core element of the continuing ELSA sample They were eligible for the main interview in Wave 2 unless they had since
18. ble residents were interviewed 1 or some interviewed 2 SURVEY MODULE IDENTIFIERS Some modules in the interview were answered by all interviewed individuals whereas others were not Each of the modules that could be answered by one individual on behalf of others has a variable that identifies the person who answered the module e Household Demographics HHRESP e Income and Assets IAPID e Housing HOPID Where modules were answered by one person on behalf of others information was copied directly to the other member s of the household or financial unit The variable CONCUR indicates whether or not the respondent was interviewed alone CONCUR 2 or concurrently with another respondent in the household CONCUR 1 The person number of the person interviewed first in the concurrent session is provided in ORDCON SAMPLE TYPE FINSTAT indicates the sample type of the individual e C1CM Core sample member e C1CP Core partner e C1YP Younger partner who responded at Wave 1 e C1YP unprod Younger partner who did not respond at Wave 1 e C1NP1 New partner found at Wave 1 who responded at Wave 1 e C1NP1_unprod New partner found at Wave 1 who did not respond at Wave 1 e C1NP2 New partner found at Wave 2 AGE DHDOBYR referred to as DHDOBY in the questionnaire and DHAGER provide the date of birth and age of respondents recorded in the household grid Note that a given respondent may not have provided this informati
19. d the IA module at Wave 1 did so again at Wave 2 If their finances were kept separately each person needed to answer the IA module separately and were treated as two separate financial units The type of financial unit the respondent was in is stored in a variable called FUTYPE The variable which identifies who answered the questions in IA is called IAPID Note that the interviewer can choose to answer IA at a later time This added flexibility for respondents and interviewers and inevitably means that a small number of people did not answer IA at all IAPID takes the value 1 when no one in the financial unit answered IA The information provided by the financial respondent is copied across to the other member of the financial unit where this is appropriate One important implication of this is that where a question refers to a person s partner or spouse e g IASPP how much does your husband wife partner receive from the state pension for individuals whose partners answered IA on their behalf the data recorded in this variable will actually be referring to them rather than their partner Details of the income that respondents received from a variety of sources over the last 12 months were collected including wages state pensions private pensions other annuity income and state benefits In addition this module covered the amount of financial and non financial assets held any income from these assets regular tra
20. ded to the individual before they respond to a question proactive or can be used after the individual has responded as a form of validation reactive Dependent interviewing was used to check some information collected during Wave 1 or HSE to determine changes in status and to control routing within the questionnaire There were various modules each covering a different area of interest The content and major routing of each module is described below Although interviews tended to follow the same module order some flexibility was given to the interviewer For example the timed walk could be administered at any time after the Health module and it was possible for interviewers to skip the Income and Assets or Housing modules if it was more convenient to do them at another time Five of the modules Cognitive Function Expectations Effort and Reward Psychosocial Health and Final Questions form the private modules block Wherever possible these modules were administered with no other household members present If two respondents were being interviewed concurrently whilst the first respondent was being asked the private block the second responding individual was asked to fill in the self completion in a separate room The two respondents then switched places The questionnaire modules are listed below in the order programmed in the CAPI interview Most of the names of the variables including derived variables in each of the modules
21. dents from the three HSE years sampled only contains those variables included in all three survey years ELSA Wave 0 Data User Guide Word available as part of PDF documentation ELSA Index File containing summary data and all Various statistical packages serial numbers for all eligible respondents from each wave ELSA Index File User Guide Word available as part of PDF documentation BACKGROUND AND AIMS The English Longitudinal Study of Ageing ELSA is a study of people aged 50 and over and their younger partners living in private households in England The sample was drawn from households that had previously responded to the Health Survey for England HSE in 1998 1999 or 2001 Every two years we hope to interview the same group of people to measure change in their health economic and social circumstances ELSA can complete the picture of what it means to grow older in the new century and help us understand what accounts for the variety of patterns that are seen This User Guide relates to data deposited for the interviews from the second Wave of ELSA which were carried out between June 2004 and July 2005 This data can be analysed cross sectionally or longitudinally in conjunction with ELSA Wave 1 data and HSE Wave 0 data both of which are in the data archive The ELSA Wave 2 interview covered a wide range of topics It was similar to the questionnaire used in Wave 1 although every module was reviewed to ensure that it
22. died had explicitly asked not to be re contacted at the end of their first ELSA interview or had moved out of Britain Therefore unlike Wave 1 respondents were eligible if they had moved to Wales or Scotland Core members who completed a main interview in Wave 2 were also eligible for a nurse visit Several other categories of individuals were also eligible for an interview but not a nurse visit at Wave 2 These were the partners of core members core partners new partners or young partners as described in Box 1 Box 1 Summary of the eligibility criteria for the Wave 2 ELSA interview Core members C1CM were individuals who had been living within the household at the time of the HSE interview in 1998 1999 or 2001 were born on or before 29 February 1952 and were subsequently interviewed as part of Wave 1 at a private residential address in England They were not eligible if they had since died asked not to be revisited or moved out of Britain Core partners C1CP were individuals who like core members had been living within the household at the time of the HSE interview in 1998 1999 or 2001 and were born on or before 29 February 1952 However they were not interviewed as part of Wave 1 so missing the baseline survey Consequently they were only approached by virtue of their being the partner of a core member Young partners C1YP were the cohabiting spouses or partners of eligible sample members who were living within the
23. e benefit income asset income other income equivalised total income equivalised employment income equivalised self employment income equivalised private pension income equivalised state pension income equivalised benefit income Eqassinc bu benefit unit equivalised asset income Eqothinc bu benefit unit equivalised other income Savings bu benefit unit total savings Invests bu benefit unit total investments Grossfw bu benefit unit total gross financial wealth Debt bu benefit unit total debt Netfw bu benefit unit total net financial wealth Netpw bu benefit unit total net physical wealth Grosstotnhw bu benefit unit total gross non housing wealth Nettotnhw bu benefit unit total net non housing wealth Ghwealth bu benefit unit total gross housing wealth Nhwealth bu benefit unit total net housing wealth Nettotw bu benefit unit total net non pension wealth DROPPED VARIABLES All variables in the questionnaire documentation with a symbol next to their name have been deleted from the archived dataset The following types of variables have been deleted in order to reduce the potential to identify individuals and for other reasons specified below 1 Those containing text 2 Those which contained a personal identifier e g name address 3 Those considered to be disclosive such as e Detailed ethnicity Specific country of birth Full interview date Full date of birth Council tax payments Different councils charge differen
24. e self completion questionnaire Final questions FQ This module was asked privately of all respondents It checked information given by respondents at the previous wave such as demographic information qualifications and the details of their stable address contact i e someone who could be contacted if the respondent had moved at the next wave to find out their new address In addition respondents were asked to nominate someone who could do a proxy interview for them at the next wave if they were unable to be interviewed in person see Proxies section below If respondents had given their consent at Wave 2 to link their survey data to health and economic data from administrative sources they were given a written reminder of this consent Respondents who had not consented to this at Wave 1 were asked if they would consent at this wave Walking speed or Measurement MM This module could be conducted at any point in the interview after the HE module The test of walking speed was completed by respondents aged 60 and over when it was judged safe to do so Respondents were asked to walk a distance of 8 feet 244 cm at their usual walking pace This walk was performed twice by respondents and the interviewer recorded the time taken using a stopwatch see protocol in interviewer instructions Self completion SC When respondents completed a full interview in a session alone the self completion questionnaire was u
25. for all respondents see below HD Household grid ID Individual demographics HE Health WP Work and Pensions A Income and Assets HO Housing FQ Final questions and consents All proxy informants completed ID HE WP and FQ Some specific questions for proxies were included in the Health module HE The modules on household demographics and housing were done as part of the proxy interview only when no one else in the household was eligible for interview In cases where no one else in the same financial unit was eligible for interview the proxy interview included the Income and Assets module If two proxy interviews were needed for a couple the Income and Assets module would only appear in one of the interviews asking about both their finances For couples comprising of one person who was interviewed by person and another who needed a proxy interview the former would automatically be asked the Income and Assets module on behalf of the couple The question about whether they keep finances together or separate would not be asked The questionnaire documentation shows whether each question was asked of proxy and or non proxy respondents If a variable has ONE asterisk next to it this means that the question was asked of both proxy and non proxy respondents If a variable has TWO asterisks next to it this means that the question was ONLY asked of proxy respondents If a variable has NO asterisks next to it this means
26. herwise the value from the household grid DHSEX was used in the derivation EDUCATION If a respondent s qualifications had been collected during the HSE or ELSA Wave 1 interviews only additional qualifications gained since the last interview were recorded at ELSA Wave 2 Those not interviewed previously were asked for all qualifications The qualifications collected during the ELSA Wave 2 interview are in FAQUZM1 to FQQUZM3 If a respondent s highest qualification is needed then a combination of Wave 1 and Wave 2 answers will likely be needed FINANCIAL VARIABLES ELSA contains very detailed information on all aspects of finances Summary variables have been derived and are available in a separate dataset ELSA Wave 2 Financial Derived Variables To derive these variables some imputation was carried out and the methods used are described in the document Financial Derived Variables User Guide and Imputation Procedures Key variables contained in this supplementary dataset are Totinc_bu Empinc_bu Seinc_bu Ppinc_bu Spinc_bu Beninc_bu Assinc_bu Othinc_bu Eqtotinc_bu Eqempinc_bu Eqseinc_bu Eqppinc_bu Eqspinc_bu Eqbeninc_bu benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit benefit unit total income employment income self employment income private pension income state pension incom
27. household at the time of the HSE and were still cohabiting with the sample member at the time of the Wave 1 interview They were born after 29 February 1952 Most but not all young partners took part in a Wave 1 interview New partners C1NP1 if identified in Wave 1 C1NP2 if identified in Wave 2 were the cohabiting spouses or partners of eligible sample members at the time of either the first or second ELSA interview who had joined the household since the original HSE interview Core partners young partners and new partners who had been identified in Wave 1 were eligible for a full Wave 2 interview even if they were no longer living with a core member at the time of the second interview That is to say we attempted to interview all partners who had been living with a core member at the time of an ELSA interview and had been separated or divorced from them or had been widowed so that we could understand their circumstances after this event had occurred The only circumstances in which partners who had separated from the core member was not approached was if they had died had explicitly asked not to be re contacted at the end of their first ELSA interview had left Britain or had moved into an institution Ex partners of core members will only be followed up once after leaving the core member s household In version 1 2 of the Wave 2 deposited dataset there are 8780 core members 57 core partners 501 younger partners and 94
28. ing these questions were only asked for incident cases i e if reported diagnosis at Wave 2 rather than Wave 1 22 osteoarthritis HEPSY1 6 Type of psychiatric problem This question was asked of people who reported having emotional nervous or psychiatric problems at HEDIBO1 9 at Wave 2 HEPSY1 6 may have been answered by people who reported having a psychiatric condition at Wave 1 as these respondents were allowed to report additional psychiatric problems at HEDIBO1 9 at Wave 2 HEPSYA to HEPSYE These questions were asked of two subsets of people i those who reported having diagnosed depression at HEPSY HE module ii those who reported symptoms of depression which they had discussed with a doctor PS module PSPSYA PSPSYE Respondent were only asked this set of questions once although they may fulfil both criteria Benefit receipt Benefit receipt Care should be taken when using the benefit receipt questions questions questions between waves 1 and 2 because variables e g IAA that have the same name do not necessarily relate to the same benefit because of changes to the benefit system between years PSFEEL Questions about Respondents were asked these questions if they PSPSYE quality of care reported five or more depressive symptoms from the received for eight item CES D scale psceda pscedh This was depression done on a listwise deletion basis i
29. ions EX This module was asked privately of all respondents It measured people s expectations in a number of dimensions the level of certainty respondents felt about the future financial decision making within households and the time frame they thought about when making financial decisions In Wave 2 respondents were also asked about the extent to which they expect to move out of their current home at some time in the future and those aged 60 or over were asked about the chances that they would move into a nursing home in the next five years Respondents were asked two open questions about the most positive and negative things about growing older although this data has not been archived as the answers are text variables see the Dropped Variables section below Effort and Reward ER This module which was asked privately of all respondents was new to Wave 2 although some of the questions in it were part of the SP module at Wave 1 It assesses respondents motivations for doing voluntary work and caring for others and the relationship between effort and reward Psychosocial health PS This module was asked privately of all respondents This module assesses symptoms of depression based on the CES D depression scale At Wave 2 respondents who reported depression symptoms on this scale were asked about the quality of healthcare they have received for depression There are some additional psychosocial questions in th
30. le responses about whether the respondent confirmed the first condition high blood pressure recorded in Wave 1 is recorded in HEDIAC1 See HEFFLAG and Section on Use of responses from previous interviews in the CAPI feed forward HEDIAN1 HEDIAN9 Reason disputed CVD condition diagnosis from Wave 1 If the respondent disputes a CVD condition they reported at Wave 1 they are asked the reason for this dispute at HEDIAN As with HEDIAC there is a separate variable for each condition See Section on Use of responses from previous interviews in the CAPI feed forward HEDIAS1 HEDIAS9 Whether still has CVD condition at Wave 2 If the respondent confirmed the CVD condition they reported at Wave 1 at HEDIAC they were asked if they still had this condition at HEDIAS As with HEDIAG there is a separate variable for each condition However there is no variable HEDIAS3 or HEDIASB8 as respondents were not asked if they still had a heart attack or stroke as this would not make sense Note that answers to this question refer to the respondent s perceptions and do not necessarily reflect any clinical judgement that they are cured See Section on Use of responses from previous interviews in the CAPI feed forward 20 HEFFLAG Reported 1 CVD At the beginning of fieldwork there was a routing condition at W1 but error for HEDIAC in the CAPI interviewing program not asked HEDIAC which meant that so
31. le Variable label Comments name HEATA Main symptom This question is asked if respondent reported 2 or making walking 1 4 more symptoms at HEATT To obtain the main mile difficult symptom for all respondents combine HEATA with symptom given at HEATTO1 by those who only had one symptom HEBALA1 Balance 1 whether These questions about the quality of care HEBALA2 did treatment after respondents have received for balance problems occur twice in the interview i after questions on walking 1 4 mile HEATT and ii after direct questions on balance HEBAL In Wave 2 the questions in the two subsets were in a different order and had different routing and therefore cannot be combined HEBALA1 asks only if known to have done exercises or had physiotherapy and asks whether the action was taken after recommendation by a doctor or nurse HEBALA2 asks if a doctor or nurse recommended the action before asking whether the respondent followed the recommendation condition at Wave 2 HEBALB1 Balance whether As above these questions occur twice in the HEBALB2 stick or zimmer interview i after questions on walking 1 4 mile recommended by HEATT and ii after direct questions on balance doctor nurse walking HEBAL In Wave 2 the questions in the two symptom subsets were in a different order and had different routing and therefore cannot be combined HEBALC1 Balance whether As above HEBALC2 stick or zim
32. me people were not asked about due to feed forward the CVD condition s they reported at Wave 1 problem HEFFLAG indicates whether or not a respondent had a condition which should have been feed forward but was not See Section on Use of responses from previous interviews in the CAPI feed forward HEDIAO1 Diagnosed For all the CVD conditions except heart attacks and HEDIA09 cardiovascular strokes respondents were not asked about named condition newly conditions they reported at Wave 1 at this question If HEDIAA01 reported at W2 respondents reported having a heart attack or stroke HEDIAAOS9 in at Wave 1 they were given the opportunity to report the a fresh diagnosis at Wave 2 However users should questionnaire also check HENMMI HEYRA and HEYRB for recent strokes or heart attacks Respondents who answered this question at Wave 1 were asked if they had been diagnosed within the last two years whereas respondents who did not answer this at Wave 1 were asked if they had ever been diagnosed HEHBP Whether doctor or This question is asked in two places but only once of named nurse suggested each respondent HEHIBPB in medication to lower i In the follow up questions to diagnosed high the blood pressure blood pressure HEDIAAO01 9 in questionnaire questionnaire HEDIA01 9 in the data HEHBPB1 recorded in HEHBP named ii After the questions about strokes HEAGE HEHIBPB1 in recorded in HEHBPB
33. ment health and relationships of the older Link to website population in England The 2004 English Longitudinal www ifs org uk elsa Study of Ageing Report on the Wave 2 data The following data and documentation are also available from the UK Data Archive Table 2 Other ELSA Files deposited at the UK Data Archive Title Format ELSA Wave 1 Core Data Various statistical packages ELSA Wave 1 Financial Derived Variables DVs Data Various statistical packages ELSA Wave 1 Pension Wealth DVs Data Various statistical packages ELSA Wave 1 Core Data User Guides and Word available as part of Documentation PDF documentation ELSA Wave 1 Variable Relationships for Financial Excel DVs ELSA Wave 1 Financial DVs Variable Name Lookup Text file details variable name truncation that may occur with SPSS data ELSA Wave 1 Pension Wealth Variable Name Lookup Text file details variable name truncation that may occur with SPSS data Health wealth and lifestyles of the older population in Link to website England The 2002 English Longitudinal Study of www ifs org uk elsa Ageing Report on the Wave 1 data ELSA Wave 0 i e Health Survey for England HSE Various statistical packages data for respondents eligible for ELSA There is a dataset for each year of HSE that was sampled for ELSA Wave 1 i e 1998 1999 2001 see Sample Design section below ELSA Wave 0 HSE Common Variables Data Various statistical packages Contains all respon
34. mer recommended by doctor nurse walking symptom HEAID1 5 Walking aids used The question about what walking aids the respondent HEAID9 12 uses is asked at three points in the interview HEAID1 7 22 i after the questions on walking 1 4 mile HEATT answers in HEAID1 5 ii after questions on balance HEBAL answers in HEAID9 12 iii after questions on activities of daily living HEADLAO01 answers in HEAID 17 22 Each respondent was only asked the HEAID question once HEOPC Whether confirms This question asked respondents about the eye diagnosed eye conditions they said they had at Wave 1 at this condition recorded in question If the respondent disputes having one or Wave 1 more of these conditions at this question the disputed conditions are recorded at HEOPW1 HEOPW2 HEOPS Whether still has eye This question was asked of respondents who reported having an eye condition at Wave 1 which they did not dispute at HEOPW1 HEOPW2 at Wave 2 see questionnaire for exact routing However this 19 is provided they gave a response at HEOPC HEOPT1 HEOPT2 Diagnosed eye condition newly reported at W2 For all the eye conditions except cataracts respondents were not asked about conditions they reported at Wave 1 If respondents reported having cataracts at Wave 1 they were still asked about cataracts again at this question to find out if they had a new diagnosis since their last interview However
35. n addition 57 productive interviews were conducted with core partners 501 with younger partners and 94 with new partners The interviewer made contact with 97 of the households that were issued for ELSA Wave 2 the household contact rate The largest component 77 of non response was a result of refusals Though many people who had moved were traced from their Wave 1 residence 11 of non responders were individuals who could not be found This is slightly higher than Wave 1 where those who had moved and could not be traced constituted 10 of issued Wave 1 non respondents 82 of those who completed a Wave 1 interview and were eligible for a Wave 2 interview as an ELSA core member took part in the survey More information about the response rates is provided in the Wave 2 Technical Report and the Wave 2 report of the findings see www ifs org uk elsa Response to key sections In addition to the overall level of response an analysis of the response to key sections or modules of the survey questionnaire was conducted Not all modules required responses at an individual level The household demographics and housing modules were asked at the household level while the income and assets module was asked at the financial unit level see section on Survey Content Table 3 shows the responses at the appropriate level for the three key modules of the main questionnaire and for the nurse visit conducted in Wave 2 after the main interview
36. new partners At Wave 2 two further types of interview were conducted with specific sub populations An end of life interview also referred to as Exit interview was sought with a relative friend or carer of any core members who had died since responding to the first ELSA interview An institution interview was sought with core members who had moved from a private household at the first ELSA interview into a residential care home or similar institution or with a proxy who could respond on their behalf The data collected during these two types of interviews is not included in the ELSA Wave 2 Core dataset but may be deposited in the archive at a later date FIELDWORK Fieldwork for the second wave of ELSA began in June 2004 and spanned 14 months finishing in July 2005 Each eligible individual within a household was sent an advance letter inviting them to take part Interviewers then visited the households to explain the study and to interview willing individuals straight away or to make appointments to call at a convenient time A number of different approaches were used to encourage participation among the sample see the ELSA Wave 1 report ACHIEVED SAMPLE The ELSA Wave 2 fieldwork produced 9432 productive interviews As explained above 8780 of these were with core sample members Of all core sample member interviews 38 people only completed a partial interview in person and 92 were interviewed by proxy see variable W2INDOUT I
37. nsfers from non household members and one off payments in the last year Housing HO Only one eligible ELSA respondent in the household answered the housing module Respondents decided themselves who the housing respondent should be but again the interviewer was instructed to suggest that the person who answered the HO module at Wave 1 answered this module again at Wave 2 Information provided by the HO respondent is copied across to other members of the household The variable HOPID identifies who answered HO on behalf of the household This module collected or checked information about respondent s current housing situation such as mortgages value of property rent etc housing related expenses and ownership of cars New questions were added on durable purchases including amount spent in the last 2 years money spent in the last four weeks on clothes leisure activities and gifts and fuel expenditure Cognitive Function CF This module was the start of the private modules block i e those which were administered with no other household members present The CF module was asked of all respondents except proxies see Proxies section and measured different aspects of the respondent s cognitive function including memory speed and mental flexibility Questions to assess respondents literacy skills replaced the numeracy questions used in Wave 1 although numeracy will be assessed again in future waves Expectat
38. on BEHDIA02 Diagnosed cardiovascular condition reported at Wave 1 2nd mention BEHDIA03 Diagnosed cardiovascular condition reported at Wave 1 3rd mention BEHDIA04 Diagnosed cardiovascular condition reported at Wave 1 4th mention BEHDIA05 Diagnosed cardiovascular condition reported at Wave 1 5th mention BEHDIA06 Diagnosed cardiovascular condition reported at Wave 1 6th mention BEHDIA07 Diagnosed cardiovascular condition reported at Wave 1 7th mention BHEAGA Age first told had angina reported at Wave 1 BHEAGB Age first told had heart attack reported at Wave 1 BHEAGC Age first told had congestive heart failure reported at Wave 1 BHEAGD Age first told had diabetes or high blood sugar reported at Wave 1 BHEAGE Age first told had stroke reported at Wave 1 BHEART1 Type of arthritis reported at Wave 1 1st mention BHEART2 Type of arthritis reported at Wave 1 2nd mention BHEART3 Type of arthritis reported at Wave 1 3rd mention BHEAGF Age first told had arthritis reported at Wave 1 BHEAGG Age first told had cancer reported at Wave 1 BHECANA Site that tumour cancer started reported at Wave 1 BHEPRK Age told had Parkinson s Disease reported at Wave 1 BHEAGH Age told had psychiatric problems reported at Wave 1 BHEAGI Age told had Alzheimer s Disease reported at Wave 1 BHEAGJ Age told had dementia reported at Wave 1 BHESMK Whether reported ever smoked cigarettes at Wave 1 BHESKA Whether smokes cigarettes at all nowadays reported at Wave 1 26
39. on themselves as anyone in the household can complete the household grid All respondents aged 90 or over have been given the following values for these variables for confidentiality reasons DHDOBYR 7 DHAGER 99 DIAGR referred to as DIAG in the questionnaire is the age given in the individual interview Again all respondents aged 90 or over have been given a value of 99 for this variable for confidentiality reasons DIAGR 99 INDOBYR is derived from the date of birth variables from the household grid DHDOB not archived and individual interview DIDBN not archived If the variable from the individual session was answered DIDBNY then this value was used otherwise the value from the household grid DHDOB was used in the derivation INDOBYR provides the year of date of birth only the day and month of birth have been dropped from the dataset to retain confidentiality INDAGER is computed from date of birth INDOB dropped from dataset and date of interview INTDAT dropped from dataset All respondents over age 90 have been classified as 99 years old for confidentiality reasons For age analysis INDOBYR and INDAGER are the suggested variables to use GENDER DISEX was the sex given in the respondent s individual questionnaire session DHSEX was given in the household demographics module INDSEX is derived from these two variables If the variable from the individual session was answered DISEX then this value was used ot
40. ondent Please note that in some cases the order of the respondent s answers in the merged variables is not the same as in the original variables EDITING As with the coding most of the editing for the ELSA Wave 1 questionnaire was carried out by the interviewers in the field However there were some additional checks that related to inconsistencies in the data which were carried out after the interview MISSING VALUES For most questions there are the following missing values 1 Not applicable 8 Don t know 9 Refusal For some questions a response of don t know or refusal was not permitted This is indicated in the questionnaire For various reasons some respondents did not complete the questionnaire Where possible for these partial interviews the questions that were not asked were coded as 1 not applicable This will be checked and refined in future versions of the dataset 3 A variable is multi coded if more than one response can be given e g favourite activities are reading and going to the cinema CONTACT DETAILS ELSA Data Manager Susan Nunn E mail s nunn natcen ac uk Telephone 020 7250 1866 NOTES ABOUT PARTICULAR VARIABLES IN THE DATA Please note that you should also look at the questionnaire to find out the exact wording of the question and response options who was eligible for each question and other information recommended by doctor nurse walking symp Variab
41. removed to reduce the potential to identify individuals Other questions in the CAPI questionnaire had code frames which included an other option e g DIKLIV In these other specify questions interviewers could use this option if the respondent s answer did not fit any of the codes or if they were not confident of coding into the prescribed codes In these cases the interviewer recorded the full other answer at a follow up question e g other responses relating to DIKLIV were recorded in DIKLO If these other specify questions were single coded i e when only 1 option could be chosen e g DIKLIV then the text answers were coded and incorporated into the original coded variable i e DIKLO For all multi coded variables that were coded there are two sets of variables The first are the original variables that contain the answers recorded by the interviewer e g SPTRAB1 to SPTRAB7 The second set of variables contain the original coding plus the codes assigned to other answers e g SPTRMO01 to SPTRM07 Note that the suffix m added to these variable names means that they contain merged original and coded answers This naming convention was followed consistently so the final merged variables can be identified by name The merged variables should be used instead of the original variables The original variables provide multi coded answers in the order in which they were mentioned by the resp
42. response was performed on data weighted by the Wave 1 weight W1WGT so that the subsequent adjustment of this weight at Wave 2 did not replicate the Wave 1 weight response The analysis showed the following groups as being the most likely to have not been successfully interviewed at Wave 2 e not interviewed at HSE e limiting longstanding illness at HSE e head of household in the lower supervisory amp technical semi routine or other National Statistics Socio Economic Classification NS SEC at Wave 1 living in London at Wave 1 sampled from HSE 1999 rather than 1998 or 2001 non white ethnicity renting or other housing tenure compared to owner occupiers at Wave 1 marital status of single never married or married first and only marriage at Wave 1 e CSE other or no educational qualifications compared to those with a degree or equivalent at Wave 1 e were current smokers at Wave 1 e females aged 85 years and over at Wave 1 The predicted probability of responding at Wave 2 for the responding individuals was inverted to provide the non response adjustment at Wave 2 The weight was trimmed truncated at the 99 percentile to avoid extreme weights having an undue influence on the estimates It was then re scaled so that the non response weight was standardised around an average of 1 Finally the non response weight was then multiplied by the Wave 1 weight This weight W2WGT was also then scaled to ensure an aver
43. ronic condition chronic conditions they reported having at HEDIAB at recorded in Wave 1 Wave 1 There is a separate variable for their responses about each of the chronic conditions So for example responses about whether the respondent confirmed the first condition chronic lung disease recorded in Wave 1 is recorded in HEDIAD1 HEDIAM1 Reason disputed If the respondent disputes a chronic condition they HEDIAM9 chronic condition reported at Wave 1 they are asked the reason for this diagnosis from Wave dispute at HEDIAM As with HEDIAD there is a 1 separate variable for each condition HEDIDS1 Whether still has If the respondent confirmed the chronic condition HEDIDS9 chronic condition at they reported at Wave 1 at HEDIAD they were asked Wave 2 if they still had this condition at HEDIDS As with HEDIAD there is a separate variable for each condition HEDIBO1 Diagnosed non Conditions already reported at Wave 1 are not HEDIBO9 cardiovascular normally re reported at this question which is named condition newly intended to ask about additional diagnoses HEDIAB1 reported at W2 HEDIAB 9 in Respondents who answered this question at Wave 1 the were asked if they had been diagnosed within the questionnaire last two years whereas respondents who did not answer this at Wave 1 were asked if they had ever been diagnosed HEARTA HEARTE Questions about quality of care received for Due to a problem with the rout
44. sually left at the end to be returned by the respondent by post However when two respondents completed the interview in a concurrent session the self completion questionnaire was completed by one respondent while the other carried out the private modules of the personal interview i e CF EX ER PS and FQ The self completion questionnaire contained measures of well being and quality of life and questions about the respondent s social circumstances for example their social participation social networks and relationships New questions were added at Wave 2 on social isolation life satisfaction and alcohol consumption PROXIES If an eligible respondent was physically or cognitively impaired or in hospital or temporary care for the whole of the fieldwork period a proxy interview was permissible Interviewers were asked to identify a proxy informant i e a person who could answer the interview on behalf of the eligible respondent The proxy informant was a responsible adult aged 16 years or over who knew enough about the respondent s circumstances to be able to provide information about them Where possible a close family member such as a partner or son or daughter fulfilled this role The CAPI program guided the interviewer through the proxy interview automatically However only a subset of questions was asked during a proxy interview The proxy interview contained the following modules the asterisked modules were not asked
45. t amounts and therefore the amount may reveal the area the respondent lives in e Water and sewerage charges These vary in different areas and therefore the amount may reveal the area the respondent lives in 4 Timing variables which give the time at specific points in the interview used for administration purposes 5 Variables that only contain missing values excluded because not useful There are no geographical variables in the archived dataset A separate geographical dataset with broad identifiers is available under secure arrangements Please contact the ELSA data manager for more details see Page 17 of the User Guide CODING AND EDITING Additional coding and editing tasks were performed after the interviews were conducted The ELSA Wave 2 Code Book and Edit Instructions document part of the main User Guide provides details of the tasks that were conducted CODING The coding of responses was mostly dealt with by the CAPI questionnaire through the use of fully closed questions There were however a number of questions e g WPHLWHO where a code frame was not used in order to capture all responses to a particular question verbatim The responses to these open questions were coded into separate variables after the interview was conducted e g open responses to WPHLWHO were coded into WPHLWZ The coded responses to open questions are in the core dataset but as mentioned above the original text responses have been
46. the Rose angina questionnaire and said that they had talked to a doctor or nurse about them HEANL Due to a problem with the routing for HEDIAG this information is not available for some people whose diagnosis was reported at Wave 1 See HEFFLAG and Section on Use of responses from previous interviews in the CAPI feed forward Although it is available for those who reported at HEDIAA at Wave 2 HECHOL Questions about HECHOL was asked of two sets of respondents HECHOLC quality of care i those who reported having a diagnosis of received for high high cholesterol AND angina heart attack cholesterol diabetes ii those who did not report a diagnosis of high cholesterol but did report pain in their sternum arm or chest at HEANI Due to a problem with the routing for HEDIAG this information is not available for some people whose angina or heart attack was reported at Wave 1 See HEFFLAG and Section on Use of responses from previous interviews in the CAPI feed forward HEDIBW1 Questions about These variables check the chronic condition s which HEDIDS9 chronic conditions the respondent reported at Wave 1 These variables reported at Wave 1 need to be used in conjunction with HEDIBO1 09 named HEDIABO01 09 in the questionnaire in order to obtain the number of people who have ever been diagnosed with one of the chronic conditions HEDIAD1 Whether confirms Respondents were asked to confirm each of the HEDIAD9 ch
47. the reporting of additional cataracts may be incomplete Respondents who answered this question at Wave 1 were asked if they had been diagnosed within the last two years whereas respondents who did not answer this at Wave 1 were asked if they had ever been diagnosed HEBPCHK Blood pressure whether checked by doctor or nurse in past year There was a routing error so this was not asked of the right age group throughout the period HEDIAW1 HEDIAS9 Questions about CVD conditions reported at Wave 1 These variables check the CVD condition s which the respondent reported at Wave 1 These variables need to be used in conjunction with HEDIA01 09 named HEDIAA01 09 in the questionnaire in order to obtain the number of people who have ever been diagnosed with a CVD condition Please note that there was a routing error for HEDIAC at the beginning of the fieldwork which meant that some people were not asked about the CVD condition s they reported at Wave 1 See HEFFLAG and Section on Use of responses from previous interviews in the CAPI feed forward Therefore users should merge in Wave 1 data to obtain the full number of those ever diagnosed HEDIAC1 HEDIAC9 Whether confirms CVD condition recorded in Wave 1 Respondents were asked to confirm each of the CVD conditions they reported having at HEDIAA at Wave 1 There is a separate variable for their responses about each of the CVD conditions So for examp
48. ting sizeable variance inflation SURVEY CONTENT As at the previous wave the Wave 2 main survey comprised a personal face to face interview and a self completion questionnaire Overall the intention in Wave 2 was to collect data about the same topics as in Wave 1 There were however some additions to the content of the interview to respond to new areas of enquiry Some questions from Wave 1 were omitted as it was decided that they did not need to be asked at every wave Furthermore several elements of the questionnaire were amended to take account of responses given at the previous wave The ELSA program allowed flexibility in administering the interview Respondents could be interviewed individually or in houses with more than one eligible respondent interviewed at the same time in a single session using concurrent interviewing techniques In a concurrent session see Survey Module Identifiers section below the same block of questions was asked alternately of each person Concurrent interviews tended to be quicker than two separate individual interview sessions and were generally more convenient for respondents ELSA Wave 2 adopted the use of dependent interviewing in many of its modules The technique is also called feeding forward data It is a technique that feeds responses individuals made at earlier interviews to either aid recall and or improve consistency of responses across interviews Earlier responses can either be provi
49. y living ADLs and instrumental activities of daily living IADLs and health behaviours Respondents aged 60 and over were asked about falls and fractures New questions were added about the quality of healthcare ELSA respondents have received for particular health conditions Social Participation SP This module was administered to all respondents It was much shorter than the Wave 1 SP module and only asked about the use of public transport The questions on caring for others were moved to the new Effort and Reward module and the questions on cultural capital e g how often the respondent eats outside the house or goes to the theatre were asked in the self completion questionnaire instead Work and Pensions WP This module was administered to all respondents The aim of this module was to update or obtain information on the respondent s current work activities if any and update or obtain information about any new or current pensions that they may have Income and Assets IA At the start of the interview couples were asked whether they kept their finances together or separate DHIASEP this variable is not in the data If kept together they were considered to be a single financial unit which required only one respondent for the IA module the financial respondent The couple decided who the respondent would be although the interviewer was instructed to suggest to the couple that the person who answere
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