LAUSR

Despite interest in vitamin D supplementation as a low-cost strategy to address overactive bladder, the findings of this study indicate oral vitamin D is not associated with prevalent overactive bladder in middle-aged and older women. Abstract Objective The objective of this study is to determine if vitamin D supplementation is associated with prevalent overactive bladder (OAB) in women across the aging spectrum. Methods We used the Nurses' Health Study (NHS) I (initiated in 1976) and NHS II (initiated in 1989) cohorts to evaluate the association of vitamin D supplements with prevalent OAB, all of which were reported by participants in 2019 in both NHS cohorts. OAB was defined as the self-reported need to rush to toilet to urinate at least sometimes. Further, OAB/wet included incontinence at least monthly because of urgency, whereas OAB/dry included incontinence once per month or less, or stress-predominant incontinence. Multivariable-adjusted odds ratios and 95% confidence intervals of OAB/dry and OAB/wet subtypes were estimated using logistic regression models. Results Among the 75,316 women (age range, 55‐98 y) from NHS and NHS II OAB prevalence was 26%. Increasing prevalence was observed across each older age group, with 41% of women 85 years or older reporting OAB symptoms. OAB/dry was more common (18%) than OAB/wet (8%). After multivariable adjustment, no clinically significant association between vitamin D supplementation and prevalent OAB or OAB type was observed. Conclusions OAB symptoms are highly prevalent across adult women, including the oldest old, who are often excluded from treatment trials. Despite interest in vitamin D supplementation as a low-cost strategy to address OAB, our findings indicate oral vitamin D is not associated with prevalent OAB in middle-aged and older women.