Although these general patterns of rates and ages of onset, have been consistently reported in previous studies, the newer studies have provided more information on the specific subtypes of disorders based on DSM-IV criteria. The more recent, studies have also included much larger samples of ethnic subgroups in the population12-15,110 that will increase the power to identify different risk profiles that may explain ethnic differences in rates of mental and behavior disorders in youth. Recent, epidemiologic surveys have also collected more extensive data on patterns of comorbidity within and between classes of mental disorders. Moreover, there has been increasing attention to comorbidity of mental and physical disorders including asthma, obesity, and headache.72,106
