The National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-1995 school year. Add Health combines longitudinal survey data on respondents' social, economic, psychological and physical well-being with contextual data on the family, neighborhood, community, school, friendships,...

The Demographic and Health Surveys (DHS) Program uses nationally representative surveys, biomarker testing, and geographic location to collect data on monitoring and impact evaluation indicators for individual countries and for cross-country comparisons. There are several survey types used, including Demographic and Health Survey, Service Provision Assessment, HIV/AIDS Indicator Survey, Malaria Indicator...

The T1D Exchange Clinic Registry collects information on individuals living with type 1 diabetes in order to help researchers characterize individuals living with the disease, conduct exploratory or hypothesis-generating analyses, and identifying participants for future clinical studies. The registry includes over 26,000 individuals with T1D, ranging in age at the time of enrollment from under 1 year...