Individual Study / LASI

The Longitudinal Aging Study in India

The Longitudinal Aging Study in India

Initiatives -
The Longitudinal Aging Study in India (LASI) is designed to be a nationally representative study of the physical, financial, and social well-being of India's 45+ population. The instrument is designed to be comparable to the Health and Retirement Study (HRS), which is a model for several studies across the world. This harmonization in instruments allows for cross-national comparative studies. In addition to a harmonized set of core questions, the instrument also reflects circumstances specific to Indian culture and institutions. The LASI instrument has three components: (1) the household survey; (2) the individual survey; and (3) the biomarker collection. Direct assessment of biomarkers, which can yield objective health measures, is particularly important in India. This report describes the following: (1) Data collection protocol, including sample sizes and response rate; (2) Laboratory protocol for the DBS assays (with the description of our quality control protocol) and the results of validation study; and (3) The distributional characteristics of biomarker data, the list of biomarker variables available in public data file, and the application procedure to obtain restricted biomarker data file.
Start Year
2010

Members

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Investigators Contacts
  • David E. Bloom

Design

Study design
Population cohort
Follow Up
LASI will be a biennial survey and will be representative of Indians aged 45 and older, with no upper age limit.
Supplementary Information
Around 1,600 age-qualifying individuals were drawn from a stratified, multistage area probability sampling design. The LASI pilot survey was conducted in 2010 in four India states— Punjab and Rajasthan in the north, and Karnataka and Kerala in the south. The sampling plan was based on the 2001 Indian Census. Two districts were randomly chosen from each of the four states. Within these districts, eight primary sampling units (PSUs) were chosen to be included in the study. PSUs were stratified across urban and rural districts within each state to capture a variety of socioeconomic conditions. Rural PSUs with fewer than 500 households were then selected through a two‐stage sampling procedure, while urban PSUs and rural PSUs with more than 500 households were selected through a three‐stage procedure.

Recruitment

Sources of Recruitment
  • Individuals
  • Other : Spouses

Number of participants

Number of participants
1,683
Number of participants with biosamples
1,306

Access

Availability of data and biosamples

Data
Biosamples
Other

Timeline

Population

The LASI pilot survey was conducted in 2010 in four India states: Punjab and Rajasthan in the north, and Karnataka and Kerala in the south. The survey was fielded in the dominant language of each state. These four states were chosen to capture the demographic, economic, health, and cultural diversity of India.
Selection Criteria
Minimum age
45
Newborns
Twins
Countries
  • India
Territory
Punjab and Rajasthan in the north, and Karnataka and Kerala in the south
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
1,683
Number of participants with biosamples
1,311
Data Collection Event
The household survey contains questions about the demographic composition of the household and identifying key informants for the following household modules: (1) housing and environment section, (2) income, (3) assets and debts, and (4) consumption. The individual survey covers: (1) demographics, (2) family and social networks, (3) health, (4) health insurance and services utilization, (5) work and employment, (6) pensions, and (7) expectations. The survey also includes the biomarkers module, which administers physical measures of health and collects dried blood spots.
Start Date
2010-10
End Date
2010-12
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
Data sources - Biosamples
  • Blood