The Longitudinal Aging Study in India (LASI) is a longitudinal survey of people aged 45 and older and their partners, living in private households in India. Its main goal is to provide a data resource on aging for multidisciplinary studies and policy-making. The survey elicits information about demographics, health, cognition, family and social networks, healthcare access and utilization, retirement and pension, employment, consumption, assets, and income.
The LASI sample is a nationally representative sample of the population aged 45 years and older, living in private households in India. The sample is also representative of India’s 29 states and 6 union territories and four selected metropolitan cities (Delhi, Kolkata, Mumbai, and Chennai). The initial sample was recruited in 2017/19 using a stratified, multistage cluster sampling of all households in India.
|Age Eligibility||Age 45 and older|
|People Interviewed per Household||All eligible residents of household|
|Spouse Inclusion||Spouse of any age|
|Representativeness||Nationally and state/union territory representative. Representative of four cities (Delhi, Kolkata, Mumbai, and Chennai)|
|Oversampling||Age 65 and older. Respondents from Delhi, Kolkata, Mumbai, and Chennai|
The LASI core interview was conducted through face-to-face interviews using computer-assisted personal interviewing (CAPI) in 2017/19.
In addition to the core interview, LASI also collects a number of other types of data.
|Health Assessment||Conducted at Wave 1 among all respondents.|
|Cognitive Assessment||Conducted in a sub-study of LASI called the Diagnostic Assessment of Dementia (LASI-DAD). LASI-DAD used the Harmonized Cognitive Assessment Protocol (HCAP) on a sub-sample of LASI respondents aged 60 and older and living in 18 states at Wave 1.|
|Blood-Based Biomarkers||Capillary blood was collected at Wave 1 among all LASI respondents via dried blood spots. Venous blood was drawn at Wave 1 among a sub-sample of LASI-DAD respondents.|
|Brain Imaging||Structural and functional magnetic resonance imaging (MRI) was conducted at Wave 1 among a sub-sample of LASI-DAD respondents.|
|Genetic Data||Genotyping was performed for a sub-sample of LASI-DAD respondents using the Illumina Infinium Global Screening Array-24 v2.0 (GSA) BeadChip. Whole genome sequencing is currently in progress for a sub-sample of LASI-DAD respondents.|
|Community Characteristics||Collected at Wave 1 for the communities where LASI respondents reside.|
|COVID-19 Phone Survey||Bi-monthly survey using computer-assisted telephone interviewing (CATI) is in progress for a sub-sample of LASI-DAD households to monitor the health and economic impacts of COVID-19 pandemic.|
The LASI Wave 1 sample included 44,462 households containing 82,650 individuals and their spouses. The LASI sample has not been refreshed.
Public access LASI data can be downloaded from the Gateway to Global Aging Data. Data are anonymized and available by request from the Gateway.
The Gateway to Global Aging Data has created several user-friendly datasets based on LASI data designed to allow researchers to conduct cross-wave and cross-study analysis.
|Harmonized LASI||A dataset of research-ready variables derived from the core interview and health assessment of Wave 1.||Coming soon|
|Harmonized LASI-DAD||A dataset of research-ready variables derived from the Harmonized Cognitive Assessment Protocol (HCAP) conducted at Wave 1.||Download via Gateway|
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