Racial/Ethnic Impact on Obstetric Anal Sphincter Injuries: A Multicentric Retrospective Study.

Introduction And Hypothesis: Obstetric anal sphincter injuries (OASIs), third- and fourth-degree lacerations, represent a severe obstetric complication. Previous studies reported a higher incidence of OASIs in Asian women in non-Asian countries. This study was aimed at establishing a different OASIs prevalence among the racial/ethnic groups in Southern European centers.