Bioelectrical impedance analysis (BIA) is a simple and quick method used for assessment of body composition (BC). Present study aims to develop and validate a BIA prediction equation for Sri Lankan adults. Healthy adults (≥18 years) were randomly selected for development and validation of the equation. BIA was performed using the Inbody 230 multifrequency analyzer. BC analysis was also evaluated by deuterium oxide (D₂O) dilution. Prediction equations for TBW/FFM were derived by linear-regression analysis. Study population included 170 adults, of which 32.9% were males. Mean age and BMI were 43.2 ± 12.6 years and 24.1 ± 4.5 kg/m², respectively. Final equation for TBW (r = 0.915, p < 0.001) and FFM (r = 0.906, p < 0.001) correlated significantly with values obtained by D₂O dilution. Therefore, this equation is suitable for estimation of BC parameters, such as TBW, FM, FFM, and %BF in Sri Lankan adults, and is possibly appropriate for use in other South Asian populations, including those living in Western countries.

生物电阻抗分析 (BIA) 是一种用于评估身体成分 (BC) 的简单快速的方法。本研究旨在为斯里兰卡成年人开发和验证 BIA 预测方程。随机选择健康成人（≥18 岁）进行方程的开发和验证。BIA 使用 Inbody 230 多频分析仪进行。还通过氧化氘 (D ₂ O) 稀释来评估 BC 分析。TBW/FFM 的预测方程是通过线性回归分析得出的。研究人群包括 170 名成年人，其中 32.9% 为男性。平均年龄和 BMI 分别为 43.2 ± 12.6 岁和 24.1 ± 4.5 kg/m ²。TBW ( r  = 0.915, p  < 0.001) 和 FFM ( r = 0.906, p < 0.001) 与通过 D ₂ O 稀释 获得的值显着相关。因此，该方程适用于估计斯里兰卡成年人的 BC 参数，例如 TBW、FM、FFM 和 %BF，并且可能适用于其他南亚人群，包括生活在西方国家的人群。