title: The relationship between normal variation in IQ and common childhood psychopathology: a clinical study.
abstract: The relationship between normal variation in IQ and common psychopathology was examined in a sample of 339 5- to 16-year-olds who were seen at a tertiary psychiatric clinic. The mean IQ was 9.6 points lower (95% CI 5.5 to 13.6 points lower) for conduct than for emotional disorders, with mixed disorders in between. For these common disorders, the mean IQ was 6.0 points lower (95% CI 1.6 to 10.3 points lower) for females than males. IQ variation in the normal range was inversely related to a dimensional measure of conduct problems - an association that was not attributable to social class or mediated by scholastic attainments. Other dimensional measures of psychopathology - covering emotional symptoms, developmental immaturity and relationship difficulties - were not significantly correlated with IQ. Limitations of the study are discussed in the paper.
authors.affiliation: Department of Child and Adolescent Psychiatry, Institute of Psychiatry, London, U.K.
authors.forename: R
authors.initials: R
authors.lastname: Goodman
mesh_terms: D000293:Adolescent; D000342:Affective Symptoms / Q000175:diagnosis / Q000453:epidemiology*; D002648:Child; D002653:Child Behavior Disorders / Q000175:diagnosis / Q000453:epidemiology*; D002675:Child, Preschool; D004522:Educational Status; D005260:Female; D006801:Humans; D007360:Intelligence; D007361:Intelligence Tests; D008297:Male; D010552:Personality Assessment; D012016:Reference Values; D012737:Sex Factors; D012917:Social Adjustment; D012923:Social Class