Sampling Strategy

LASI-DAD draws a sub-sample of 3,000 respondents from the baseline LASI sample at age 60 or older. In collaboration with the Regional Geriatric Centers (RGCs), we interview the respondents either at their homes or the participating hospitals, reaching out to both rural and urban areas from 14 states across the country, representing the country as a whole.

In selecting the study sample, we examine their cognitive test performance during the baseline LASI study and proxy interviews for those who did not participate in the cognitive tests and identify those who are at high risk of cognitive impairment. We then oversample those at high risk and also recruit those at low and very low risk.