For the purpose of the present study, we used data from COGA Phase II interviews, including measures of social support, to address our primary research questions as that is when social support was measured. We focused on COGA participants of European or African ancestry as determined by their genetic information who also self-identified as European American or Black/African American, respectively. We included participants who (1) were between ages 18–65 at the Phase II assessment, (2) had genomic data available for the calculation of alc-PRS, and (3) indicated that they had ever used alcohol. Our analytic sample included 4,011 (mean age = 38.43, SD = 11.96, 54.5% female) EAs and 1,274 (mean age = 35.97, SD = 11.11, 54.8% female) AAs. Results from independent sample t-tests indicated that individuals who were included in the analytic sample of the present study reported more drinks per week (p < .001) and were younger (p < .001) compared to those who completed the COGA Phase II assessment but were not included in the present study; however, they did not differ in terms of sex,
