“…Offord & Cross (1969) reviewed such studies and concluded that there was a correlation between 'disturbed' behaviour in childhood and early illness-onset; there was also an association between the latter and minimal brain dysfunction. The evidence from child guidance clinics is that attenders who go on to develop schizophrenia are mostly male, and show a mixture of antisocial and emotional problems in childhood (Garmezy, 1974;Zeitlin, 1986). Males are also over-represented among cohorts of'schizoid' children (Wolff & Chick, 1980), such children being considered prone to the later development of schizophrenia (see Gunderson & Siever, 1985;Kendler, 1985).…”