that continues through early adulthood. Our cross-sectional data reflect this increase with a near doubling of rates from 13–14 years (8.4%) to 17–18 years (15.4%). Also consistent with prior cross-sectional and prospective research, the median onset of behavior disorders is slightly earlier than that of mood disorders, with a later peak for conduct disorder than for oppositional defiant disorder. 32 Finally, the later onset and steeper increase in rates of substance use disorders across adolescence has been repeatedly demonstrated, despite different prevalence periods and assessment methods. 33
