Henoch-Schönlein purpura epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Epidemiology and demgraphics

HSP occurs more often in children than in adults, and usually follows an upper respiratory tract infection. Half of affected patients are below the age of six, and 90% under ten. It occurs more often in boys than in girls (about twice as often).

The incidence of HSP in children is about 20 per 100,000 children per year; this makes it the most common vasculitis in childhood.