Table 5 provides the results for testing sex differences in the correlations cross-sectionally. For all age groups, male and female MZ correlations and male DZ, female DZ and DZ opposite sex correlations could be constrained to be equal. Therefore, Table 5 shows the pooled correlations over sex, together with thresholds estimates and deviations from the threshold for females. As described in the section on measurement invariance, there was some indication for true sex differences in CAGE scores (i.e., sex differences that were not due to differences in measurement across sex). To account for these differences, sex effects on the thresholds were tested. Dropping the sex effect on the threshold led to a significantly worse model fit in all age groups (15–17: χ2 (1) = 15.86, p < 0.001; 18–20: χ2 (1) = 109.33, p < 0.001; 21–23: χ2 (1) = 153.15, p < 0.001; 24–26: χ2 (1) = 157.37, p < 0.001; 27–29: χ2 (1) = 67.86, p = 0.001; and 30–32: χ2 (1) = 59.65, p < 0.001). This indicates that the prevalence of giving one or more positive
