eligible to provide a DNA sample. The current study includes three cohorts, which matriculated in Fall 2011 (N = 2,714), 2012 (N = 2,486), and 2013 (N = 2,403), for a total N = 7,603. Of these, 98% provided a DNA sample. As the current analyses are based on the data capture after the Spring 2014 survey, data were available for 2–4 waves, depending on cohort. At wave 1 (61% female), the average (SD) age was 18.59 (0.61); at wave 2 (65% female), 18.99 (0.44); at wave 3 (66% female), 19.94 (0.60); and at wave 4 (66% female), 20.93 (0.69).
