Obesity and the prevalence of nocturia in Japanese elderly patients with type 2 diabetes mellitus: The Dogo study.

AimNocturia is common among patients with type2 diabetes mellitus, but limited evidence regarding the association between body mass index (BMI) and nocturia exists among such patients. The aim of the present study, therefore, was to evaluate the association between BMI and nocturia among Japanese patients with type2 diabetes mellitus. MethodsStudy participants were 809 Japanese patients with type2 diabetes mellitus. Study participants were considered to have nocturia if they answered two or more to the question: How many times do you typically wake up to urinate from sleeping at night until waking in the morning? We used the following two outcomes: (i) moderate nocturia was defined as 2 voids per night; and (ii) severe nocturia was defined as 3 voids per night. Participants were categorized into four groups according to their BMI: (i) BMI <18.5; (ii) 18.5BMI<25; (iii) 25BMI<30; and (iv) BMI 30. Multiple logistical regression analysis for nocturia in relation to BMI was used, with the category of 18.5BMI<25 as the reference. ResultsObesity (BMI 30) was independently positively associated with severe nocturia among elderly patients (age 65years) with type2 diabetes mellitus, but not among young and middle-aged patients: the adjusted OR was 2.96 (95% CI 1.10-7.83). BMI was not associated with moderate nocturia in all patients. ConclusionsIn Japanese elderly patients with type2 diabetes mellitus, obesity was independently positively associated with severe nocturia. Geriatr Gerontol Int 2017; 17: 2460-2465.