Development of prediction equations for body composition in Indian children using bioelectrical impedance analysis

Bandana Sen, Dilip Mahalanabis


We aimed to develop a BIA equation to predict fat free mass (FFM) using deuterium oxide (2H2O) dilution as the reference method for children. Seventy seven children (36 boys and 41 girls), aged 6 to 24 month participated in the study. The best fit FFM prediction equation included weight, sex and length2/resistance (adjusted R2=0.83 and root mean square error of 0.49 kg). Applying ‘leave-one-out’ method the mean of the differences of FFM in kg and % body weight were nearly zero with 95% confidence intervals of ±0.108 kg between those derived by 2H2O dilution and by the validated equation. PRESS statistic residual was 473g (»0). The best fit equation for FFMkg was:

FFMkg=0.72+0.30× (weight) +0.16× (sex) +0.52× (Length2/resistance)

(Length in cm, weight in kg, resistance in W, sex: boys=1, girls=0)

The derived predictive equation has good precision and is useful for community based studies on body composition in South Asian children. 


Fat free mass, Deuterium oxide, Young children, Total Body Water, Bioelectrical Impedance

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