Abstract
Results: In all, 370 945 individuals were included in the study, of whom 13 212 were exposed to ultrasound. The exposed group demonstrated a tendency toward a higher risk of schizophrenia (men: crude incidence rate ratio (IRR) 1.58, 95% CI, 0.99–2.51; women: crude IRR 1.26, 95% CI, 0.62–2.55). However, men and women born in two and four of the seven tertiary-level hospitals without ultrasound scanning respectively also had higher risks of schizophrenia compared with those born in other hospitals. For other psychoses there were no differences between groups. Conclusions: No clear associations between prenatal ultrasound exposure and schizophrenia or other psychoses were found. Other factors related to place of birth might have influenced the results.
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