The averaged ES for all studies was g = .304 [standard error (SE) = .134; standard deviation (SD) = .371]. This ES was significantly different from 0, t(18) = 2.257, p = .037. The test for heterogeneity of ES was also significant, χ2(18) = 52.400, p < .001. These findings indicate that non-AUD participants had significantly greater WM volume relative to AUD participants and that the magnitude of this advantage varied significantly across studies (see Figure 1).
