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  • Title: Percent body fat prediction equations for 8- to 17-year-old American children.
    Author: Stevens J, Cai J, Truesdale KP, Cuttler L, Robinson TN, Roberts AL.
    Journal: Pediatr Obes; 2014 Aug; 9(4):260-71. PubMed ID: 23670857.
    Abstract:
    BACKGROUND: Percent body fat equations are usually developed in specific populations and have low generalizability. OBJECTIVES: To use a nationally representative sample of the American youth population (8-17 years old) from the 1999-2004 National Health and Nutrition Examination Survey data to develop gender-specific percent body fat equations. METHODS: Percent body fat equations were developed for girls and boys using information on weight, height, waist circumference, triceps skin-folds, age, race/ethnicity and menses status compared to dual-emission X-ray absorptiometry. Terms were selected using forward and backward selection in regression models in a 2/3 development sample and were cross-validated in the remaining sample. Final coefficients were estimated in the full sample. RESULTS: Final equations included ten terms in girls and eight terms in boys including interactions with age and race/ethnicity. In the cross-validation sample, the adjusted R2 was 0.818 and the root mean squared error was 2.758 in girls. Comparable estimates in boys were 0.893 and 2.525. Systematic bias was not detected in the estimates by race/ethnicity or by body mass index categories. CONCLUSION: Gender-specific percent body fat equations were developed in youth with a strong potential for generalizability and utilization by other investigators studying adiposity-related issues in youth.
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