We next compared the characteristics of those included in the genetic enrichment analysis to those who did not provide DNA or were dropped from analysis for quality control issues among non-Hispanic Whites only (total pool of non-Hispanic Whites included in the factor model N = 1223, non-Hispanic Whites without genetic data N = 886). The proportion of females in the analysis sample (64.4%) was significantly greater than in the non-analysis sample (56.9%), χ2(1) = 5.69, p = 0.017. Among the phenotypes examined (the factor scores), only marijuana use, F(1,1221) = 9.61, p < 0.01, d = 0.19, significantly differed between those who were (M = 0.19, SD = 0.57) and were not (M = 0.09, SD = 0.48) included in enrichment analyses (all other ps > 0.05).
