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Title: Accuracy of Siri and Brozek equations in the percent body fat estimation in older adults.
Author: Guerra RS, Amaral TF, Marques E, Mota J, Restivo MT.
Journal: J Nutr Health Aging; 2010 Nov; 14(9):744-8. PubMed ID: 21085903.
Abstract:
OBJECTIVE: To identify which equation, Siri or Brozek, based on the two compartment model, provides a more accurate conversion of body density (BD) in percent body fat (%BF) in a group of older adults. STUDY DESIGN: Cross-sectional study. SETTING: Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto. PARTICIPANTS: 60 older adults, aged 60-92 years. MEASUREMENTS: Skinfold thickness was used to estimate BD through Visser et al. prediction equation. The conversion of BD to %BF was done with Siri (%BF-Siri) and Brozek (%BF-Brozek) formulas and these determined values were both compared to Dual-Energy X-ray Absorptiometry (%BF-DXA) evaluations. RESULTS: A strong correlation between the %BF-DXA value and %BF-Siri (r=0.91, p < 0.001) and %BF-Brozek (r=0.91, p < 0.001) was found, although %BF-Siri and %BF-Brozek overestimated %BF-DXA (p < 0.001). The comparison of the %BF-Siri and %BF-Brozek mean values also revealed significant differences (p < 0.001). The %BF-Brozek reflects a better agreement than the %BF-Siri with %BF-DXA with respectively a mean difference of -4.0 %BF (limits of agreement = -10.9 to 2.9%) and -5.7 %BF (-12.6 to 1.2). The Bland and Altman plots confirmed that %BF-Brozek reflects a better agreement with %BF-DXA. CONCLUSION: The results of the present study show that the use of Brozek equation may correspond to a more accurate alternative than Siri equation for the conversion of BD in %BF in older adults.

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