Objective
To estimate how symptom severity, extent of bother, and quality of life differ across urinary incontinence (UI) subtypes.
Methods
We evaluated prevalent UI cases from the Nurses' Health Studies, including women aged 41–83 years. Women with UI (leaking more than once a month) were subclassified according to reported symptoms as stress (leakage with activity), urgency (leakage with urgency), or mixed UI (stress and urgency co-occurring equally). UI severity was assessed in 102,418 women, based on the Sandvik severity index. In a subset of older women with weekly UI, we asked about bother (n=1,697) and quality of life (Incontinence Impact Questionnaire; n=1,748). UI severity, bother, and quality of life were compared across subtypes using polytomous logistic regression, adjusting for other characteristics.
Results
The distribution of UI subtypes was 51% stress, 27% urgency, and 22% mixed UI. About half had slight UI, 26% had moderate, and 23% had severe UI. Severe UI was more common in women reporting mixed (37%), than urgency (27%) or stress UI symptoms (15%) (P<0.001). More women with severe mixed (21%, P=0.02) and urgency UI symptoms (13%, P=0.1) reported being “greatly” bothered by their UI, compared with stress UI (10%). Women with severe mixed (mean 18.0, P<0.001) and urgency UI symptoms (mean 13.4, P=0.004) had higher mean Incontinence Impact scores compared with stress UI (mean 9.8).
Conclusion
Women reporting mixed UI symptoms describe more severe and bothersome incontinence, with higher effect on quality of life.