the annual incidence if 0.1-0.5 per 1000 of the population.
incidence is highest between the ages of 35 and 39 in both males and females.
the prevalance of schizophrenia in the population is 2.5-5.3 per 1000.
risk for first-degree relatives of also being affected by the disorder is 10%. The risk of children being affected is 40%. Concordance in monozygotic twins is 40 to 50%; in dizygotic twins the concordance is 10%.
there is an excess of winter births among people in whom schizophrenia develops (by about 8%). The significance and mechanism associated with this risk factor are unknown.
there is an increased prevalence of gestational and birth complications in patients who subsequently develop schizophrenia.
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