Birth complications and subsequent negative symptoms in schizophrenia.

A sample of 29 men with an initial psychotic episode and diagnosis of schizophrenia as young adults were followed into middle adulthood. All had prior child guidance clinic contact. The negative symptoms of affect deficit in young adulthood but not the positive symptoms of thought disorder were predicted by a history of birth complications. Subjects with birth complications who developed negative symptoms had a stable deficit over the follow-up period.