Developmental link to later psychosis

The population-based, case-control study in 105 people with schizophrenia or other non-affective disorders and 213 controls showed impaired hearing at age four increased the risk of later non-affective psychosis sixfold and impaired speech increased it twofold.

Both associations were adjusted for parental psychiatric history, occupational class and obstetric complications.

The authors said psychosis originates in early neurodevelopment and early impairment in hearing and speech may indicate similar developmental mechanisms related to common