Study of chronic schizophrenics with positive and negative family histories of psychosis

Abstract
We found no differences in clinical symptoms among chronic schizophrenics with a family history of psychosis (n= 18) and without any affected relatives (n= 22). The lifetime morbidity risks of psychosis in the former group were 0.59 ± 0.13 for children and 0.33 ± 0.07 for siblings.