The estimated lifetime prevalence of<unk>  disorder among adults worldwide is 1 to 3 percent, and the lifetime prevalence of<unk>  I and<unk>  II disorder was 2.8 percent. The mean age of onset for<unk>  I disorder is 18 years and for<unk>  II disorder 20 years. The one-year prevalence of<unk>  I disorder in people aged 65 years and older is approximately 0.4 percent and the lifetime rate is 0.8 percent. These rates were less than rates in younger individuals.
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