The prevalence of each disorder was: AN = 3.6% (n = 245), MDD = 26.2% (n = 1,659), and SA (including suicide completions) = 1.9% (n = 128). A total of 226 women (3.3%) met criteria for both AN and MDD, 17 (0.2%) had AN and SA, and 90 (1.3%) had MDD and SA. Fifteen women had a lifetime history of all three phenotypes. No differences in prevalence between MZ and DZ twins were observed for AN (χ2 = 1.31, p < .26), MDD (χ2 = 0.11, p < .74), or SA (χ2 = 0.32, p < .58). The phenotypic correlations were .34 (95% CI: .27, .41), .30 (95% CI: .18, .42), and .50 (95% CI: .42, .57) for AN-MDD, AN-SA, and MDD-SA, respectively.
