Chronic urticaria
A total of 29 studies have reported the occurrence of rhinitis in 6,082,712 patients with chronic urticaria (CU), resulting in a pooled prevalence of 28.7% (95% CI 20.4%–36.9%).11-13,17,18,40,41,43,44,46-53,55,56,58-63,65The pooled prevalence of AR was 27.7% (95% CI, 8.8%–46.7%) in patients with CU. The prevalence was 30.9% (95% CI, 11.9%–50.0%) in children and adolescents and 26.8% (95% CI 19.5%–34.2%) in adults. When stratifying CU subtypes, the prevalence of rhinitis was 33.4% (95% CI, 8.3%–58.5%) in patients with chronic spontaneous urticaria (CSU) and 34.6% (95% CI 17.3%–51.9%) in those with chronic idiopathic urticaria (CIU). Only one study reported the prevalence of rhinitis in patients with both CSU and CIU (31.7%).62By geographical area, the prevalence of rhinitis was 23.7% (95% CI 13.2%–34.1%) in European, 30.4% (95% CI 16.2%–44.6%) in Asian, 33.5% (95% CI 18.1%–48.9%) in North American, and 29% (95% CI 20.6%–37.5%) in South American patients with CU.