Development and validation of an equation to estimate body fat in elderly women
Abstract The purpose of this present study was to develop and validate a prediction equation for body composition assessment using anthropometric measures of elderly women. This is cross-sectional correlational study with 243 older women ± 64.5 years old and body mass index (BMI) ± 28.70 kg/m². For the development of the equation it was utilized the method of hold-out sample validation. The participants were randomly divided into equation development group (96 elderly women) and a group for validation (147 elderly women). Total body mass, height, waist and hip circumferences, ratio waist-hip ratio and BMI were measured. The whole-body dual-energy X-ray absorptiometry (DXA) assessed body composition (percentage of body fat, fat mass, and fat-free mass). The equations were developed using multiple linear regression, with validation by the stepwise method; the comparison of the equations was analyzed by the paired Student's t test and the analysis of residual scores by the method of Blant and Altman. The New Equation presents a strong correlation (R = 0.83) and (R² = 0.69), and a standard error of estimation equals to 3.21% for percentage body fat prediction. The mean difference between the estimations of percentage body fat from DXA and the New Equation was 0.11% (t(0,180); P = 0.850). Therefore, the New Equation had an accuracy of 93.5% and a total error of 1.8%. The body fat estimation in older women using this New Equation based on BMI and age is valid and accurate.
Main Authors: | Damasceno,Vinicius de Oliveira, Barros,Tercio Araújo do Rego, Gomes,Willemax dos Santos, Santos,Jhonnatan Vasconcelos Pereira, Ferreira,Daniela Karina da Silva, Campos,Eduardo Zapaterra, Costa,André dos Santos |
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Format: | Digital revista |
Language: | English |
Published: |
Universidade Federal de Santa Catarina
2020
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Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1980-00372020000100358 |
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