In 2004, COGA launched the Prospective Study that aims to examine how genetic risks unfold across development and in conjunction with the environment. Specifically, offspring of adults in the COGA extended families who were aged between 12 and 22 and had at least one parent who completed SSAGA in the original COGA adult interviews were recruited for the COGA Prospective Sample (Bucholz et al., 2017). These offspring participants complete SSAGA, or an adolescent version of SSAGA (i.e., CSSAGA) if they were younger than 18 years old, at enrollment and are re-interviewed at about 2-year intervals. For those COGA Prospective participants where only one parent had completed SSAGA, the other parent was invited for a SSAGA interview when his/her offspring enrolled in the COGA Prospective Study.
