extraversion [B(2041) = −0.16, p = 0.62]; baseline peer deviance [B(2015) = −0.75, p = 0.08]; alcohol frequency [B(1729) = −0.23, p = 0.34]; alcohol quantity [B(1690) = 0.02, p = 0.94]; alcohol problems [B(1980) = −0.01, p = 0.90]; symptoms of anxiety [t(1995) = −0.73, p = 0.47]; or symptoms of depression [t(1993) = 0.12, p = 0.91]. A small number of students who participated in the survey portion in the fall, but did not give DNA at that time, chose to do so in the spring (N = 59). Invitations were also sent to 1960 individuals who did not participate in the fall; this group consisted of nonresponders from the fall who were still enrolled at the university (N = 1567 who were part of the original 3623 invitations), as well as students who had aged up to be eligible for participation (e.g., they were under 18 years of age during fall data collection), and students who had transferred into the university (N = 393). Of these individuals, 34% completed the survey (N = 659); 93% of whom picked up their payments. Of those who came in, 92% (N = 563) also chose to give DNA.
