[Validation of the OMRON BF 300 monitor for measuring body fat by bioelectric impedance].
OBJECTIVE
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.


METHODS
Cross-sectional descriptive study.


METHODS
Primary care. Coronel de Palma and San Fernando Health Centres, Móstoles.


METHODS
88 people took part in the assessment of the accuracy of the monitor, and 91 in the validation.


RESULTS
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.


RESULTS
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%.


CONCLUSIONS
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.
Martín Moreno
V
V
Médico. Centro de Salud Coronel de Palma. Móstoles. Madrid. amanvic@teleline.es
Gómez Gandoy
B
B
Antoranz González
M
M
Fernández Herranz
S
S
Gómez De La Cámara
A
A
de Oya Otero
M
M
D000273:Adipose Tissue; D000293:Adolescent; D000328:Adult; D001823:Body Composition; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged