Retrospective Evaluation of Body Composition Parameters Measured by Bioimpedance Method According to Gender, Age, and BMI: The Case of Siirt Province

Objective: To evaluate body composition parameters determined by bioelectrical impedance analysis (BIA) in adults aged 19-64 years in Siirt, Türkiye, across gender, age, and body mass index (BMI) categories. Materials and Methods: This retrospective study ana- lyzed single measurement data from 1062 adults (286 males, 776 females) recorded at the Siirt Healthy Life Center between 2021 and 2024. Measurements were ob- tained using an InBody 270 device. Descriptive statistics, Welch’s ANOVA, Games-Howell tests, and multiple linear regression were applied (p<0.05). Results: Females exhibited significantly higher BMI, total fat mass, and visceral fat levels than males, whereas men showed greater fat-free mass, skeletal muscle mass, and bone mineral content. Regression analysis identified vis- ceral fat level, skeletal muscle mass, and age as the factors most strongly associated with BMI (R²=0.822). Conclusions: Increased visceral adiposity in females and older age groups, along with the insufficiency of BMI alone, underscores the importance of gender-specific com- position analyses in obesity management.