Study population
The primary inclusion criterion for the study was outpatients at the ZJU
PAG clinic who were under the age of 18 between 2005 and 2018. Among
207,287 patients with information on the primary diagnosis at first
clinical presentation, 110,035 patients were excluded because they were
diagnosed with urologicĀ or other non-gynecological diseasesĀ or
conditions. The final analysis included 97, 252 patients.