Association Between Interdialytic Weight Gain, Perception About Dry Weight, and Dietary and Fluid Behaviors Based on Body Mass Index Among Patients on Hemodialysis

Objective This study aimed to identify dietary and fluid behaviors associated with relative interdialytic weight gain (RIDWG) (divided by the respective dry weight [DW]) by stratifying the patients according to body mass index (BMI). Design and methods This was a cross-sectional, multicenter investigation. Between July 2016 and March 2017, data were collected from 4 Japanese dialysis centers in 3 cities. The patients (n = 577) were asked to reply to a self-completed questionnaire, including questions on perception about DW and dietary and fluid behaviors. The differences in perception about DW and dietary and fluid behaviors were compared between RIDWG nonadherence (average RIDWG ≥5％ a month) and adherence subgroups. Results The 360 participants were stratified into thin ( Conclusion Dietary and fluid behaviors associated with RIDWG differed according to the BMI group. Assessing more specific types of patient behaviors, focusing on the underlying factors associated with dietary and fluid behaviors, and taking BMI into consideration are required.