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Validation of Bioelectric Impedance Analysis against Dual-Energy X-ray Absorptiometry for assessment of body composition in Indian children aged 5 to 18 years

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Abstract

Objective

To validate body composition measurements by Bioelectric Impedance Analysis (BIA) against Dual-Energy X-ray Absorptiometry (DXA) as the reference method in healthy children and adolescents.

Design

Cross-sectional

Setting

Schools in and around Pune city, India.

Participants

A random sample of 210 (114 boys, 96 girls) apparently healthy Indian children and adolescents (5–18 y).

Methods

Weight, height, Tanner stage (TS) were recorded. Body composition measures: fat-free mass (FFM), fat mass (FM), lean mass (LM), bone mineral content (BMC) and body fat percentage (%BF) were assessed by BIA and DXA on a single day. Agreement between the methods was estimated by Pearson’s correlation, and Bland and Altman analysis.

Main outcome measures

%BF, FM, FFM, LM, BMC.

Results

BIA underestimated %BF by 6.7 (3.7)% as compared to DXA. Mean FFM, BMC and LM by BIA were significantly higher than by DXA (P<0.001). These differences remained similar after adjusting for age, BMI and TS. Mean differences between FFM (−2.32 (1.39) kg), BMC (−0.18 (0.15) kg), and LM (−2.15 (1.34) kg) by DXA and BIA were significant (P<0.01). Correlations between BIA and DXA were 0.92 for %BF, 0.96 for LM and 0.98 for FFM and BMC. Both the methods were similar in identifying normal and overfat children as per their respective cut-offs.

Conclusion

BIA and DXA techniques are not interchangeable for assessment of body composition. However, BIA may be used in the field/clinical setting preferably with ethnicity specific references.

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Correspondence to Anuradha Khadilkar.

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Chiplonkar, S., Kajale, N., Ekbote, V. et al. Validation of Bioelectric Impedance Analysis against Dual-Energy X-ray Absorptiometry for assessment of body composition in Indian children aged 5 to 18 years. Indian Pediatr 54, 919–924 (2017). https://doi.org/10.1007/s13312-017-1182-3

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  • DOI: https://doi.org/10.1007/s13312-017-1182-3

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