Although alcoholics tend not to differ from nonalcoholic
control subjects on the Extraversion scale (Barnes
1983; Cox 1979), less is known about their prealcoholic
personality characteristics. The Oakland Growth Study,
which provided longitudinal assessment of youth through
middle age, found that males who later became alcoholic
had an adolescent personality that was more sociable than
adolescents who did not become alcoholic in adulthood