The study has been funded by three Program Projects over the period 1994 to 2013 by the National Institutes of Child Health and Human Development (P01 HD031921) with co-funding from 23 other Federal agencies and national foundations. Add Health has become a national data resource for over 10,000 Add Health researchers who have obtained more than 500 independently funded research grants and have produced thousands of peer-reviewed research articles published in multiple disciplinary journals and research outlets. Below we describe the design of Add Health and its sibling pairs subsample, followed by the types of data available, a summary of research findings, and data access.
