Objective: To test developmental paths from adolescent syndromes and other candidate predictors to young adult syndromes.
Method: A national sample assessed at ages 13 through 16 and 16 through 19 years was reassessed at 19 through 22 years in terms of six syndromes derived empirically from parent and self-reports, two syndromes derived only from parent reports, and one derived from self-reports.
Results: Several young adult syndromes were similar to adolescent syndromes and were strongly predicted by these syndromes. A new syndrome designated as Shows Off and an adult Aggressive Behavior syndrome were both predicted by the adolescent Aggressive Behavior syndrome. This indicates a developmental transition away from overt aggression among some aggressive youths but not others. A syndrome designated as Irresponsible was predicted by the adolescent Attention Problems syndrome and may be an adult phenotype of attention deficit disorder. Surprisingly, attention problems were associated with more diverse problems among females than males.
Conclusions: There are strong predictive relations from adolescent to adult syndromes. Sex differences in predictive paths argue against basing assumptions about both sexes on findings for one sex.