Epidemiology
The diagnostic criteria for schizoaffective disorder have changed significantly over the past few decades, compromising the ability to conduct long-term epidemiologic studies.
As a result, there are no large-scale epidemiologic data on US, or worldwide, prevalence or incidence of schizoaffective disorder.
Schizoaffective disorder is estimated to be less common than schizophrenia.[1]
Age of onset: 30% of people have their onset under the age of 25 years, 30% between ages 25 and 35 years, and 30% above the age of 35 years.[3]
Sex distribution: appears to occur more frequently in women.[4]
In regional studies, lifetime prevalence for schizoaffective disorder varies from 0.32% to 1.1%.[5][6] One meta-analysis found a pooled prevalence of 3.53% among homeless people.[7]
Estimates place schizoaffective disorder at about 10% to 30% of inpatient admissions for psychosis.[8]
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