Hearing impairment and psychosis: A replication in a cohort of young adults

Previous work has demonstrated an association between hearing impairment and psychosis. In the current study, this association was studied in a cohort of young people. In addition, it was studied to what degree duration of hearing problems (i.e. onset earlier in life) impacted on risk. Data were derived from the Greek National Perinatal Survey, a prospective birth cohort study of 11,048 neonates at baseline, 6594 seven-year olds at T1 and 3500 nineteen-year olds at T2. A significant association was found at age 19 years between the presence of hearing impairment and the presence of self-reported positive psychotic-like experiences (β = 0.18, S.E. = 0.02, p < 0.000). In addition, this association was conditional on the duration of hearing problems, in that the association at age 19 years was stronger if hearing impairment had already been reported at age 7 years (test for interaction: p = 0.022). These results replicate previous findings of an association between hearing impairment and psychosis, extend it to the age range of late adolescence, and suggest that longer duration is associated with stronger risk.