Inverted BMI rather than BMI is a better predictor of DEXA determined body fatness in children

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Abstract

This study compared body mass index (BMI) and inverted BMI (iBMI) as predictors of body fatness in 177 Portuguese children (149 girls and 96 boys) aged 7-16 years. Participants undertook measures of height and body mass from which BMI (kg/m 2) and iBMI (cm 2 /kg) were determined. Maturation was determined via self-report and fat mass index (FMI, kg/m 2) via dual-energy X-ray absorptiometry. Significant relationships were evident between BMI and iBMI and FMI (both P=0.0001). BMI was not normally distributed (P=0.0001) but iBMI was (P>0.05). Analysis of covariance identified that BMI and iBMI, controlling for maturation, were both significant predictors of FMI (both P=0.0001) but that iBMI predicted a slightly greater amount of the variance (adjusted R 2 =0.970) compared with BMI (adjusted R 2 =0.968). This study suggests that iBMI is a similar proxy for body fatness compared with BMI in children. © 2014 Macmillan Publishers Limited. All rights reserved.

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Duncan, M. J., Martins, C., Silva, G., Marques, E., Mota, J., & Aires, L. (2014). Inverted BMI rather than BMI is a better predictor of DEXA determined body fatness in children. European Journal of Clinical Nutrition, 68(5), 638–640. https://doi.org/10.1038/ejcn.2013.285

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