Prevalence and risk factors for urinary incontinence up to 2 years postpartum: a cross-sectional population-based study.

INTRODUCTION AND HYPOTHESIS: Urinary incontinence (UI) is common in the postpartum period; however, most studies focus on the early postpartum period and assess prevalence at only one or two time points. We hypothesized that UI would be prevalent across the first 2 years postpartum. Our secondary objective was to evaluate risk factors for postpartum UI among a nationally representative, contemporary sample.

METHODS: This cross-sectional, population-based study used National Health and Nutrition Examination Survey (2011-2018) data for parous women within 24 months following delivery. Prevalence of UI, UI subtypes, and severity were estimated. Multivariate logistic regression was used to estimate adjusted odds (aOR) of UI for exposures of interest.

RESULTS: Among 560 postpartum women, prevalence of any UI was 43.5%. Stress UI was most common (28.7%), and most women (82.8%) experienced mild symptoms. There was no significant change in prevalence of UI across the 24 months following delivery (R2  = 0.004). Individuals with postpartum UI tended to be older (30.3 ± 0.5 versus 28.8 ± 0.5 years) and had higher BMI (31.1 ± 0.6 versus 28.9 ± 0.6). In multivariate analysis, odds of postpartum UI were higher for women who had had a prior vaginal delivery (aOR 2.0, 95% CI: 1.3-3.3), prior delivery of a baby weighing 9 lb (4 kg) or more (aOR 2.5, 95% CI: 1.3-4.8), or who reported current smoking (aOR 1.5, 95% CI: 1.0-2.3).

CONCLUSIONS: During the first 2 years postpartum 43.5% of women report UI, with relatively stable prevalence over this period. This high prevalence supports screening for UI after delivery regardless of risk factors.