The incidence of Granulomatosis with polyangiitis in children ranges form 0.03 to 3.2 per 100,000 per year. The prevalence in the United States is 3 per 100,000 persons. The mean age of diagnosis of granulomatosis with polyangiitis is 58 years. The disease most commonly presents in patients that are either middle aged or elderly. The mean age of diagnosis in children is between the ages of 4 to 17. Males are more commonly affected with Granulomatosis with polyangiitis. The overall male to female ratio is approximately 1.2 to 1. In children females are more commonly seen with the disease. Granulomatosis with polyangiitis typically affects Caucasians.
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