Regarding alcohol-use variables, we found the expected effects given the study’s selection criteria: TNAD participants, relative to NSAC participants, (a) had earlier onset of alcohol use, (b) had consumed more alcohol, and (c) were more likely to have had a previous intoxication. Of note here is that several NSAC participants had experimented with alcohol, but at a later age than TNAD. Statistical comparison between groups of variables associated with selection criteria are not warranted; however, we note that aside from duration of regular alcohol use (where boys had significant longer drinking histories than girls), there were no other significant main effects of gender, or group x gender interactions, with regard to the alcohol-use variables.
