Patient demographics
During 2002-2018, 380 children with a diagnosis of CSU recorded in their medical records were evaluated. After reviewing the medical files, 250 patients (65.8%) had CSU according to the defined criteria and were included in the study. The remaining 130 were excluded either because they did not fulfill the criteria for CSU (113 children) or due to lack of follow-up data (17 children). Of the 250 patients included, 136 were females (54.4%). The mean age at diagnosis was 11.4 ± 5.1 years, median 12 years (range 0.9-18.0). Among the study group, 122 (48%) were adolescents (13-18 years old). There was no significant difference in the prevalence of CSU by sex; except for the adolescents, where females comprised 60% of the group (p=0.07) (Table 1).