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Childhood developmental abnormalities have been previously described in schizophrenia. It is not known, however, whether childhood developmental impairment is specific to schizophrenia or is merely a marker for a range of psychiatric outcomes.

A 1-year birth cohort (1972-1973) of 1037 children enrolled in the Dunedin Multidisciplinary Health and Development Study was assessed at biennial intervals between ages 3 and 11 years on emotional, behavioral, and interpersonal problems, motor and language development, and intelligence. At age 11 years, children were asked about psychotic symptoms. At age 26 years,DSM-IVdiagnoses were made using the Diagnostic Interview Schedule. Study members having schizophreniform disorder (n = 36 [3.7%]) were compared with healthy controls and also with groups diagnosed as having mania (n = 20 [2%]) and nonpsychotic anxiety or …