In the United States 2.2-2.6% of the population is affected with psoriasis. The prevalence varies between the ethnic groups in the US, as the incidence of psoriasis among African Americans is only 1.3%. This is in congruence with the fact that the prevalence of psoriasis among West Africans is only 0.3% and the ancestors of African Americans mostly originated from that area.
There is also considerable difference between West and East African populations, as the psoriasis prevalence is almost 7 times higher in the eastern population .The prevalence of psoriasis among Asian populations is rather low, only 0.3% . Some populations, namely American Samoas and South American Indians, lack psoriasis completely . Psoriasis incidence has increased significantly during the last three decades, but the reason behind this rise is still unknown .
Latitude also affects psoriasis prevalence, probably through the beneficial effects of sunlight on psoriasis. Psoriasis affects men and women as often, even though there have been studies showing differences between the sexes.
1- Prevalence of psoriasis is highest in Northern Europe (streptococcal infections), 2- (China) prevalence rates of psoriasis are highest in northern provinces compared with southern provinces 3-Australian, Arctic Inuit have little or no psoriasis;( mortality from streptococcal epidemics has occurred only recently), 4-Prevalence rates of psoriasis among populations are due to genetic rather than environmental effects as migrating populations from an area with high occurrence of historical streptococcal epidemics (Europe) and low occurrence of streptococcal epidemics (West Africa) have kept their high and low prevalence rates (respectively) of psoriasis.
See also for more information about prevalence of psoriasis
See also for more information about prevalence of psoriasis
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