Add Health provides numerous opportunities for genetic research. During the Wave III (2001-02) in-home interview, buccal cell DNA samples were collected from the twins and full sibs in the sibling pairs sample (N~2,600) with high compliance rates (83%). These DNA samples were genotyped for seven widely studied candidate polymorphisms and the zygosity status of twins confirmed by the Institute for Behavioral Genetics at the University of Colorado Boulder. Additional information and documentation in “Biomarkers in Wave III of the Add Health Study” are posted on the Add Health web site (http://www.cpc.unc.edu/projects/addhealth/data/guides/biomark.pdf) and available in Harris et al. (2006).
