Ribeiro Edineia Aparecida Gomes, Leal Danielle Biazzi, de Assis Maria Alice Altenburg
Programa de Pós-graduação em Educação Física, Universidade Federal de Santa Catarina, Florianópolis, SC, Brasil.
Rev Bras Epidemiol. 2014 Jan-Mar;17(1):243-54. doi: 10.1590/1415-790x201400010019eng.
To evaluate the accuracy of the body mass index (BMI), waist circumference (WC) and waist-to-height ratio (WHtR) in detecting excess body fat among schoolchildren in Florianópolis, Santa Catarina.
Cross-sectional study with 2,772 schoolchildren aged seven to ten years. Receiver Operating Characteristic (ROC) curves were used to compare the diagnostic accuracy of the BMI, the WC and the WHtR in identifying children with excess body fat (defined as values that were equal to or higher than the 90th percentile of the standardized residuals obtained from the sum of the four skinfolds thickness). Likelihood ratio estimates were used to select, for each anthropometric index, the cut-off points that presented the highest association with excess body fat.
The BMI, WC and WHtR performed well in detecting excess body fat, indicated by areas under the ROC curve (AUC) close to 1.0, with slightly higher AUC for the BMI in comparison to the WC and the WHtR concerning both sexes. Highly sensitive and specific cut-off points were derived for the three anthropometric indices. Sensitivity ranged from 85.7 to 92.9% for the BMI, from 78.6 to 89.7% for the WC, and from 78.6 to 89.2% for the WHtR. Specificity ranged from 83.2 to 91.4%, from 75.0 to 90.7%, and from 77.4 to 88.3% for the BMI, the WC and the WHtR, respectively.
BMI, WC and WHtR can be used as diagnostic tests to identify excess body fat in children from seven to ten years of age.
评估体重指数（BMI）、腰围（WC）和腰高比（WHtR）在检测圣卡塔琳娜州弗洛里亚诺波利斯市学童体内脂肪过多情况时的准确性。
对2772名7至10岁的学童进行横断面研究。采用受试者工作特征（ROC）曲线比较BMI、WC和WHtR在识别体内脂肪过多儿童（定义为等于或高于从四处皮褶厚度总和得出的标准化残差第90百分位数的值）方面的诊断准确性。使用似然比估计值为每个身体测量指标选择与体内脂肪过多关联最高的切点。
BMI、WC和WHtR在检测体内脂肪过多方面表现良好，ROC曲线下面积（AUC）接近1.0，就两性而言，BMI的AUC略高于WC和WHtR。为这三个身体测量指标得出了高灵敏度和高特异性的切点。BMI的灵敏度范围为85.7%至92.9%，WC为78.6%至89.7%，WHtR为78.6%至89.2%。BMI、WC和WHtR的特异性分别为83.2%至91.4%、75.0%至90.7%和77.4%至88.3%。
BMI、WC和WHtR可作为诊断测试用于识别7至10岁儿童体内脂肪过多的情况。
