Fig. 1From: Risk of obstetric anal sphincter injury increases with maternal age irrespective of parity: a population-based register studyRisk of OASI by maternal age in first, second and third births. Adjusted Odds Ratio with 95% Confidence Interval (CI): Reference 1= < 25 years. Logistic regression analyses adjusted for year of birth, education, country/region of birth, smoking, BMI, infant birthweight, fetal presentation, and in second and third births history of OASI and history of cesarean section in the previous birthBack to article page