As summarized in Figure 2, genetic factors accounted for the majority of the covariance between AUD and DIV (52.0% [48.8, 67.9] for males and 53.7% [17.6, 54.5] for females), followed by nonshared environmental factors (45.0% [37.5, 54.9] for males and 41.6% [40.3, 60.2] for females). Shared environmental factors accounted for only a trivial amount of the covariance (3.0% [−3.0, 13.5] for males and 4.8% [0.0, 6.6] for females).
