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Page: Incidence and Prevalence
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In the western world, schizophrenia is typically diagnosed in late adolescence or early adulthood. In the western world, it is found approximately equally in men and women, though the onset tends to be later in women, who also tend to have a better course and outcome. Although rare, there are also instances of childhood onset schizophrenia and late-onset schizophrenia that occurs in the elderly.
The lifetime prevalence of schizophrenia is commonly given at 1%; however, a recent review of studies from around the world estimated it to be 0.55%. The same study also found that prevalence may vary greatly from country to country, despite the received wisdom that schizophrenia occurs at the same rate throughout the world. It is worth noting however, that this may be in part due to differences in the way schizophrenia is diagnosed. The incidence of schizophrenia was given as a range of between 7.5 and 16.3 cases per year per 100,000 population.
Schizophrenia is also a major cause of disability. In a recent 14-country study, active psychosis was ranked the third most disabling condition after quadriplegia and dementia and before paraplegia and blindness.
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