Results of regression models predicting internalizing, externalizing, and total problems from parent and co-twin AUD are shown in Tables 4–6, respectively. Means and standard deviations of raw scores are also shown. Offspring of an affected parent (Group 1) scored higher on internalizing compared to offspring from control families (Group 4). Differences between Group 4 and offspring of an unaffected parent with an alcoholic MZ or DZ co-twin (Groups 2 and 3) were non-significant. Differences between Group 1 and either of Groups 2 or 3 were also non-significant. This pattern was observed regardless of adjustment for offspring age and sex.
