The National Longitudinal Study of Adolescent to Adult Health (Add Health) is a longitudinal study of a nationally representative sample of >20,000 adolescents, originally in grades 7-12 during 1994-95, and then followed for 5 waves to date, last in 2016-18. Over the years, Add Health collected demographic, social, familial, socioeconomic, behavioral, psychosocial, cognitive, and health survey data from participants & their parents; a vast array of contextual data from participants’ schools, neighborhoods, and geographies of residence; and in-home physical and biological data from participants, including genetic markers, blood-based assays, anthropometric measures, and medications. Ancillary studies have added even more data over the years. Data from the project are available in various forms.
Read about this and other population healthcare databases in our resource containing ~350 healthcare database profiles from 43 countries.