LASI: Study Overview
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 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.
