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Comparative Study of Five Skinfold-thickness Equations for Predicting Percentage Body Fat in Obese Children and Adolescents

MAO Aihua;WANG Rui;Sport College of Henan Normal University;  
Objective: To study comparatively five different skinfold-thickness equations for predicting percentage body fat,and try to find out a relatively appropriate method to estimate body fat mass in obese children and adolescents of Han population. Methods: According to gender and age,76 obese children and adolescents of Han population were divided into 4groups,and were measured in body height and body weight,waist and hip circumference,skinfolds and bioelectrical impedance analysis( BIA). Correlation and agreement between the skinfold-thickness equations involves Lohman,Brozek,Siri,Slaughter,and Chinese prediction equations and BIA. were analyzed. Results: Firstly,Brozek equation and Siri equation overestimated body fat mass in all subjects,but Chinese prediction equation underestimated it. Secondly,for 13 ~ 18 yrs girls,Slaughter equation best predicted body fat mass and gave the highest correlation( R = 0. 833) and the lowest bias and limits of agreement compared with BIA. Thirdly,Lohman equation overestimated body fat mass in 7 ~ 12 yrs boys while underestimated body fat mass in 7 ~ 12 yrs girls and 13 ~ 18 yrs boys,denoting the equation was not suitable for the test groups.Conclusion: Compared to other prediction equations through various types of skin fold thickness,it seems that Slaughter equation may be used in 13 ~ 18 yrs female obese adolescents of Han population.
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