The epidemiology of early-onset psychosis

This chapter provides an overview of population-based epidemiological studies on the incidence and prevalence of early-onset psychosis (EOP; onset of illness before age 18 years) and psychotic-like experiences (PLE) in adolescence. The incidence of EOP increases between 13 and 18 years of age, and peaks in young adulthood. Moreover, most studies suggest an increased incidence of EOP in boys compared to girls, but findings vary depending on contextual factors including diagnostic criteria. Compared to the relatively rare occurrence of EOP, PLE are common in adolescence. Contrary to EOP, the prevalence of PLE declines from childhood to adolescence and adulthood. Methodological considerations and suggestions for future research are discussed.