Prevalence of overactive bladder among overweight and obese women: A prospective cross-sectional cohort study

Objective: To evaluate the effect of body mass index (BMI) on the prevalence of overactive bladder syndrome (OAB), severity of symptoms, and quality of life in affected patients.

Methods: We conducted a prospective cross-sectional study of 1351 consecutive patients who were recruited between June 2021 and May 2022. Patients were divided according to BMI (normal: <25.0, overweight: 25-29.9, obese: ≥30) and menopausal status. The latter were divided according to the presence or absence of urinary incontinence in the normal, wet-OAB and dry-OAB groups. A validated questionnaire, the International Consultation on Incontinence Questionnaire in Overactive Bladder (ICIQ-OAB), in the English and Arabic languages was used.

Results: A total of 1351 patients were included. For women who were overweight, there was a greater prevalence of dry-OAB (p = 0.02), However, the prevalence of both dry and wet-OAB were higher in obese women (p < 0.00001). Compared to women with a normal BMI, women who were overweight or obese had a greater likelihood of developing abnormal daytime urine frequency and nocturia, with p values ≤ 0.01. The ORs of overweight and obese women were 3.1 and 5.3, respectively, for experiencing wet OAB in comparison to women with a normal BMI. Additionally, the odds of developing severe OAB in overweight and obese women were 5.8 and 18.6, respectively, which negatively affects their quality of life (QoL).

Conclusion: The risk of developing OAB symptomatology is significantly greater in overweight and obese patients. As BMI increases, the symptomatology, perceived discomfort and QoL of patients with OAB worsen.