To investigate prevalence and risk factors for symptomatic pelvic organ prolapse (sPOP) and sPOP concomitant with urinary incontinence (UI) in women 20 years after one vaginal delivery or one caesarean delivery.Design
Registry-based national cohort study.Setting
Women who returned a postal questionnaire in 2008 (response rate 65.2%).Population
Singleton primiparae with a birth in 1985–88 and no further births (n = 5236).Methods
The SWEPOP study used validated questionnaires about sPOP and UI.Main outcome measures
Prevalence rate and risk of sPOP with or without concomitant UI.Results
Prevalence of sPOP was higher after vaginal delivery compared with caesarean section (14.6 versus 6.3%, odds ratio [OR] 2.55; 95% confidence interval [95% CI] 1.98–3.28) but was not increased after acute compared with elective caesarean section. Episiotomy, vacuum extraction and second-degree or more laceration were not associated with increased risk of sPOP compared with spontaneous vaginal delivery. Symptomatic POP increased 3% (OR 1.03; 95% CI 1.01–1.05) with each unit increase of current BMI and by 3% (OR 1.03; 95% CI 1.02–1.05) for each 100 g increase of infant birthweight. Mothers ≤160 cm who delivered a child with birthweight ≥4000 g had a doubled prevalence of sPOP compared with short mothers who delivered an infant weighing <4000 g (24.2 versus 13.4%, OR 2.06; 95% CI 1.19–3.55). Women with sPOP had UI and UI > 10 years more often than women without prolapse.Conclusion
The prevalence of sPOP was doubled after vaginal delivery compared with caesarean section, two decades after one birth. Infant birthweight and current BMI were risk factors for sPOP after vaginal delivery.