Table 5.

Additional findings

Childhood behavioural traits (maternal rating)	Various behaviours, particularly withdrawn, aggressive behaviour, aged 13-16, are significant predictors of the later development of psychotic symptoms and schizophrenic illness
Schizotypal features (assessed by interviews with psychiatrist)	A combination of schizotypal features, including social withdrawal, psychotic symptoms, socio-emotional dysfunction and odd behaviour, is predictive of schizophrenia. On an individual basis, these features are not predictive
Self-rated schizotypal cognitions	Total scores highly associated with the presence of psychotic symptoms and high scorers at increased risk of schizophrenia
Neurodevelopmental indices	Minor physical anomalies more frequent in high risk subjects than controls.
	No relationship with psychotic symptoms or genetic liability
Hypertelorism	Interlens and interorbital distance greater in first episode schizophrenics and high risk subjects than controls, but not associated with psychotic symptoms or genetic liability
Illicit drug use and life events	Cannabis and other illicit drugs associated with psychotic symptoms in high risk subjects and controls. Major life events associated with psychotic symptoms