Epidemiology

In the US, the prevalence of psoriatic arthritis (PsA) is between 0.05% and 0.25% and the incidence is between 3.6 and 7.2 per 100,000 patient-years in the general population.[5]

While PsA is uncommon in the general population, it occurs frequently in patients with psoriasis. According to a large meta-analysis of psoriasis patients, the prevalence of concurrent PsA is around 20%, rising to 25% in patients with moderate-to-severe disease.[6]

PsA occurs equally in men and women, although earlier disease onset is observed in men. The incidence of PsA in women peaks in the 6th decade, mirroring an age-specific rise in the incidence of the skin disease in women. It is hypothesized that hormonal factors influence this sex difference.[7][8]​​ PsA has been much less studied in black people and Asian people, compared with white people.[9]

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