Studies in child click here psychiatric epidemiology have begun to focus far more on identifying explanations for specific patterns of comorbidity than simply documenting that, comorbidity is pervasive.63 Substance use disorders Trends of drug and alcohol use in high-school youth in the US arc carefully monitored by studies such as Monitoring the Future (MTF).65 The 2007 MTF survey that, encompassed nearly 50 000 8th-, 10th-, and 12th-gra.de students in over 400 secondary schools nationwide continues to show a decline in illicit drug use across the US. However, this survey Inhibitors,research,lifescience,medical does not collect information on substance use disorders. The median estimate of alcohol or drug

abuse or dependence in community surveys of adolescents is 5% with a range from 1% to 24%. 8 The results of the recent studies described in Table I yield similar estimates: 4.7%,13 5.3%, 14 2.4%, 12 and 1.7%.15 The lower Inhibitors,research,lifescience,medical rates in the latter two studies are likely to be attributed to the lower age range of these samples. For example, in the Great Smoky Mountains Survey, there was a dramatic increase in the rates of substance use disorders with age, with a 3-month prevalence rate of 0.3% at age 13,1.4% at age 14,5.3% at age 15, and 7.6% at age 16. Gender differences in prevalence rates of substance use disorders are inconsistent. Whereas several studies show Inhibitors,research,lifescience,medical equal prevalence rates in males and females,13 others show that males have greater rates than

females.14 Substance use disorders have been generally Inhibitors,research,lifescience,medical shown to be more common in white youths, and equally distributed by parental social class.66

Risk factors for mental disorders in youth Aside from providing extensive information on regional differences in mental disorders in the US, the majority of prior population studies of mental disorders in youth have also included longitudinal follow-up that provide information on the predictors and consequences of mental disorders.17,19,21,35,67,68 Prospective Inhibitors,research,lifescience,medical follow-up of youth from many of the above studies have shown that child and adolescent mental disorders are related to a wide array of adverse outcomes.69,70 Risk factors for the development of mental disorders in children have been divided into child characteristics and those of his/her parents/family. Child characteristics include gender, age, ethnicity, physical health, cognitive and psychological function, pre- and perinatal exposures to illness, physical stress, alcohol, drugs, nutrition, crotamiton infections and other environmental agents, and lifetime history of environmental exposures to toxins, stress, infections, social environment and stressful life events; family and parent characteristics including parental education, age, social class, employment, psychiatric and medical history, and family function, structure,7,10,19,71 and neighborhood and broader contextual influences on the health of children and their families.