Statistics for the prevalence of psoriasis in the United States and country wise in the world is given below.
- Psoriasis is a very common condition.
- The incidence of psoriasis is seen at any age but more commonly between the age of 15 years and 25 years.
- Psoriatic arthritis can develop at any age but is more commonly seen between the ages of 30 to 50 years.
Psoriasis Statistics for US
- In the U.S. about 2% to 3% of the population is affected. That translates roughly to 7.5 to 8 million people.
- Caucasians (white people) have double the rate of psoriasis than African Americans. Prevalence among the American Africans is 1.3 % compared to 2.5 % among the Caucasians.
Worldwide Statistics for Psoriasis
- Worldwide, about 125 million people are affected by psoriasis — that is 2% to 3% of the world population.
- About 25% of people with psoriasis have moderate to severe psoriasis.
- 71% of children affected by psoriasis show a strong family history, thus showing a strong genetic component.
- About 1/3rd of psoriasis patients have at least one relative with psoriasis.
- A child is 10% more prone to develop psoriasis if one parent has it and this psoriasis rate increases to 50% if both the parents have psoriasis.
- According to The National Psoriasis Foundation, about 10% to 30% of psoriasis patients develop psoriatic arthritis.
- About 60% of psoriasis patients miss an average of 26 days of work during one year due to this illness.
- It is found that psoriasis is more prevalent in moderate to cold climates and less frequent in tropical climates.
Psoriasis Statistics by Country
Below are country wise statistics of ten countries for psoriasis starting from the highest to lowest.
- Scandinavia – 7 to 8%
- Denmark – 5 to 6%
- Germany – 4%
- USA – 2 to 3%
- Canada – 2 to 3%
- Russia – 2 to 3%
- Northern Europe – 2 to 3%
- Great Britain – 2%
- China – 0.37%
- Kuwait – 0.11%
Incidence of psoriasis is highest in Northern Europe and so is incidence of streptococcal infection. Aboriginals (Australia and the Artic) and native Americans show no prevalence of psoriasis. Genetic component of psoriasis is stronger rather than any contributing environmental factor.
In America, the whites show a higher prevalence having migrated from Europe, while the black population shows a much reduced incidence having migrated from West Africa which has and had a low incidence of psoriasis.