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Maternal smoking during pregnancy appears to be a robust independent risk factor for conduct disorder in male offspring. Maternal smoking during pregnancy may have direct adverse effects on the developing fetus or be a marker for a heretofore unmeasured characteristic of mothers that is of etiologic significance conduct disorder.

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Prevalence rates of disruptive child behaviors, based on structured psychiatric interviews, are presented for samples of clinic-referred prepubertal boys at two sites to investigate differences and similarities among reports of the behaviors from children, parents, and teachers. Children reported significantly less hyperactive/inattentive and oppositional behaviors than either parents or teachers. In contrast, children did not differ from parents or teachers in their report on the prevalence of more serious conduct problems. These results were well replicated across two sites, despite the fact that there were significant differences between the sites in the level of hyperactive/inattentive child behaviors and conduct problems. The ranking of parents' and teachers' reported prevalence of specific child behavior problems in each of the three domains of disruptive behavior was strikingly similar. With one exception, the concordance between the prevalence ranking based on the children's reports was lower than that based on adults' reports, Children's reports on their own behavior did not predict various child handicaps 1 year later as well as did adults' reports. The results are discussed in relation to the usefulness of certain child behaviors in symptom lists for diagnostic purposes; the reliability of children's reports on their own behavior; and the possible reasons why prevalence rankings, as perceived by adults, are so similar.

The question of which informant on childhood behavior disorders is the most useful an'd valid for which disorders influences diagnostic accuracy and research findings. The present study focuses on 177 boys, most of whom had been referred to outpatient services because they were displaying disruptive behavior. The boys, their mothers, and their teachers responded to a psychiatric interview concerning the boys' behavior. Analyses of conditional agreements between informants show that children, as compared with mothers and teachers, were less adequate informants on their own hyperactivity and inattentiveness. The same applied to children's reports of their own oppositional behavior. In contrast, children's reports of their conduct problems tended to complement the reports by adults. Although informants agreed significantly on the presence of many disruptive child behaviors, there were several on which they did not agree, particularly in the realm of hyperactivity/inattentiveness. There were few age differences between older and younger boys in this sample of 7- to 12-year-olds. The implications of the findings for research and clinical practice are discussed.