Psoriasis epidemiology and demographics
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
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Epidemiology and Demographics
Prevalence
The prevalence of psoriasis in Western populations is estimated to be around 2-3%.
Age
Onset before age 40 usually indicates a greater genetic susceptibility and a more severe or recurrent course of psoriasis.
Gender
Psoriasis affects both sexes equally and can occur at any age, although it most commonly appears for the first time between the ages of 15 and 25 years.
Developed Countries
A survey [2] conducted by the National Psoriasis Foundation (a US based psoriasis education and advocacy group, which is partly funded by pharmaceutical companies) found a prevalence of 2.1% among adult Americans. The study also found that 35% of people with psoriasis could be classified as having moderate to severe psoriasis.