ELSA English Longitudinal Study of Ageing Future Activities Carli Lessof National Centre for Social...

ELSAEnglish LongitudinalStudy of Ageing

Introductory workshop to the English Longitudinal Study of Ageing

5 July 2005

Royal Statistical Society, London

Future ActivitiesFuture Activities

Carli LessofCarli LessofNational Centre for Social ResearchNational Centre for Social Research

HSE 1998& Nurse Visit


ELSA Wave One 2002/3Core Interview (12,100 respondents)


ELSA Wave Two 2004/5Core Interview + Nurse Visit


ELSA Wave Three 2006/7Core Interview + Retrospective Interview


The English Longitudinal Study of AgeingThe English Longitudinal Study of Ageing






Survey Content at Wave 3Survey Content at Wave 3

As at Wave 2 core modules remain

Repeat cross-sectional questions Dependent interviewing where prior data is available (Temporary) removal of some questions

Some additions Revisions to health questions e.g. dental health Take-up of benefit Expectations of life expectancy Reintroduction of questions e.g. GHQ12, social capital Vignettes Experimental module on diet and physical activity


Major Changes at Wave 3Major Changes at Wave 3

Continuation with Institutional and Exit interviews

Introduction of refreshment sample

Longevity of the study

Key pre-retirement group and cohort effects

Aged 50-53 and their younger (and older) partners

Current plan for HSE 2001, 2002, 2003

Retrospective interview


ELSA Life History Data ELSA Life History Data

Background and motivation

Development timetable

Methodology

Content

Validation


Why Collect Life History Data?Why Collect Life History Data?

History of birth cohort studies in Britain

Shown influence of early and mid life events

Identified social and biological chains of risk

ELSA has a relatively large fraction life unobserved

Are there measures we can obtain that will help explain future outcomes and trajectories?

National Survey of Health and Development (NSHD)Those living in GB born 3-9 March, 1946

National Survey of Health and Development (NSHD)Those living in GB born 3-9 March, 1946

National Child Development Study (NCDS)All those living in GB born 3-9 March, 1958

National Child Development Study (NCDS)All those living in GB born 3-9 March, 1958

1970 British Cohort Study (BCS70)All those living in GB born 5-11 April, 1970

1970 British Cohort Study (BCS70)All those living in GB born 5-11 April, 1970

Millennium Cohort Study (MCS)All those born in selected areas of UK over 12 months

beginning September 2000 in England and Wales, and December 2000 in Scotland and Northern Ireland

Millennium Cohort Study (MCS)All those born in selected areas of UK over 12 months

beginning September 2000 in England and Wales, and December 2000 in Scotland and Northern Ireland

The four British birth cohort studiesThe four British birth cohort studies


UK Cohort dataUK Cohort data

Year of birth

Age

50

1946 1958 1970 2000NSHD NCDS BCS MC



100

50

1902 ELSA

Year of birth

Age

1946 1958 1970 2000NSHD NCDS BCS MC

1952



100

50

1946 1958 1970 2000NCHD NCDS BCS MC

Year of birth

Age

1902 ELSA 1956



100

50

1946 1958 1970 2000NCHD NCDS BCS MC

Year of birth

Age

1902 ELSA 1956



100

50

1946 1958 1970 2000NCHD NCDS BCS MC

Year of birth

Age

1902 ELSA 1956


Types of Life History Data CollectedTypes of Life History Data Collected

Measures in core questionnaire

Administrative data

Retrospective survey to cover life pre-ELSA


Recall data in ELSA baseline/core (1)Recall data in ELSA baseline/core (1)

Early life events Who study member lived with in childhood Employment of study member’s father/parent when 15

Education At HSE asked for highest educational qualification At Waves 1, 2 & future waves ask for new qualifications

Relationships and fertility Household membership and relationships from W0 Living children (within and outside household) from W1


Housing and geographical mobility Address and characteristics of home from W0 (HSE) Postcode related information about area

Health events Major health events ever and since last wave

Jobs, income and pensions Job, NS(SEC), SOC2000 from W0 onwards

Including main job for those already retired

Recall data in ELSA baseline/core (2)Recall data in ELSA baseline/core (2)


Linkage to administrative dataLinkage to administrative data

NHS Central Register

Employer (for private pension plan details)

Hospital Episodes database

National Insurance contributions (post 1978)

Benefits (incl. state pension payments) and tax credits

(post 1999)


Development of the Retrospective InterviewDevelopment of the Retrospective Interview

Design and content in development

Decisions are inter-linked

Pre-pilot September 2005

Pilots in approx November 2005 and January 2006


Design and methodologyDesign and methodology

Life-grid methods good for ‘autobiographical’ recall Berney and Blane; Belli instrument for PSID

But in addition we will want Detailed routed follow-ups for events/spells

More general retrospective recall items

Paper, computer or hybrid methodology Combine life-grid with recall follow-ups delivered by CAPI


Design questions Design questions

Individual (but may check demographics with couples)

Same interviewer

Immediate follow-up (off-year survey in 2007 possible)

Feed forward from ELSA core or independence

Degree of precision - year, decade, life-stage


Content: General principlesContent: General principles

Motivation for inclusion of topics/questions that are: Predictive of late life events and trajectories

Prevalent

Recalled with acceptable degree of precision

We will not have topics that are solely of interest for: Modelling trajectories pre-ELSA

Understanding cross-sectional prevalence of early life factors for older cohorts


Content (1): Family and demographicsContent (1): Family and demographics

Place of birth and subsequent residences

Location and tenure; characteristics; area characteristics

Periods evacuated, abroad, in army, in institutions

Marriage / divorce / cohabitation / widowhood

Pregnancies and births

Parents age and cause of death

Quality of relationships with parents, sibs, carers


Content (2): Early lifeContent (2): Early life

Education history

Indicators of material circumstances: bath/indoor toilet/water supply; shared bedrooms; books

Relationship with parents


Content (3): EmploymentContent (3): Employment

Start and end of job (and employer) spell

Full time / part time

Pension membership (Yes/No)

Earnings when started; earnings when stopped

Job characteristics

Physical, intellectual, emotional demands of work;

control and effort/reward in job; exposure to risk


Content (4): Health Content (4): Health

History of CVD, cancers and osteoarthritis

Information about hospitalisations and operations

Serious injuries

Smoking history - times stopped started/periods

Age of menarche and menopause


Content (5): Other Life-eventsContent (5): Other Life-events

Migrant experiences

Whether life similar to parents / children

Subjectively most important life events


Some possible validation exercisesSome possible validation exercises

Overlap between prospective and retrospective accountsfor example in housing transitions and employment spells

Comparing administrative health data with retrospective histories e.g. knee replacements and other surgery

Compare National Insurance Contribution records with accounts of employment history, opting out of SERPS, etc

Comparison to NCHD and NCDS cohort histories









The English Longitudinal Study of AgeingThe English Longitudinal Study of Ageing





ELSA Wave Four 2008/9Core Interview + Nurse Visit

ELSA Wave Four 2008/9Core Interview + Nurse Visit

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