<prompt> Answer this question truthfullyWhat is the epidemiology and demographics of Henoch-Schönlein purpura?  <response>: <reason> Epidemiology and demgraphics of HSP: The incidence of HSP is approximately 6-20 cases per 100,000 individuals.The prevalence of HSP is more in children of 4-6 years age group.HSP usually affects Caucasians than any other ethnic groups.Males are more commonly affected by HSP than females. The Male to female ratio is approximately 1.5-2:1. 