Validación del monitor de medición de la grasa corporal por impedancia bioeléctrica OMRON BF 300

Abstract

To assess the accuracy of the OMRON BF 300 body fat monitor using bioelectric impedance and to validate its measurement of body fat percentage (BF%) against the Siri equation. Cross-sectional descriptive study. Primary care. Coronel de Palma and San Fernando Health Centres, Móstoles. 88 people took part in the assessment of the accuracy of the monitor, and 91 in the validation. The BF% were recorded in triplicate, with the mean being the figure noted. Precision was evaluated through the intra-class correlation coefficient (ICC) and the coefficient of variation (CV); validity, through technical error, the ICC and the Bland-Altman method. In the Siri equation, body density was calculated through the Durnin-Womersley equation. Precision: ICC was 0.999 and CV 0.4 +/- 0.03. the difference between the BF% monitor (26.6 +/- 9.1%) and the Siri equation (27.8 +/- 8.2%) was -1.27% (p < 0.01; 95% CI -1.97 to -0.57); the technical error of the monitor was 2.2% and of the ICC 0.956 (95% CI, 0.9335-0.9710). Thus, 80.2% of the monitor-equation differences were below 5%, with a concordance interval under the Bland-Altman method of +5.45 to -7.99%. The OMRON BF 300 monitor satisfies the precision criteria (ICC > 0.95 and low CV) and validation (excellent technical error, ICC > 0.75 and clinically acceptable differences) and is a valid alternative to cutaneous folds as a method of assessing nutrition of the patient.