Ethnic Group Differences in Waist Circumference Percentiles Among U.S. Children and Adolescents: Estimates from the 1999–2008 National Health and Nutrition Examination Surveys
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Waist circumference (WC) may be a better predictor of cardiovascular disease risk than body mass index (BMI). We provide the most current WC percentile estimates for the U.S. Mexican-American (MA), non-Hispanic black (NHB), and non-Hispanic white (NHW) pediatric populations.Percentile regression analyses were used to estimate the 10(th), 25(th), 50(th), 75(th), and 90(th) percentiles of the distribution of WC for boys (n=8,351) and girls (n=8,054) for ages 2-18 by ethnicity using the combined 1999-2008 National Health and Nutrition Examination Surveys.MA boys were over 2.5 times as likely versus NHB [odds ratio (OR)=2.60, 95% confidence interval (CI) 1.73-2.52] and almost twice as likely versus NHW (OR=1.86, 95% CI 1.73-2.52) to have a WC above the 90(th) percentile. NHB (89.1 cm) and MA (88.8 cm) girls ages 11 and older and NHW girls (88.7 cm) ages 12 and older who had a WC at or above the 90(th) percentile meet adult WC criteria for the metabolic syndrome (88 cm). MA boys (105.1 cm) ages 14 and older, and NHB (105.1 cm) and NHW boys (105.0 cm) ages 16 and older that had a WC at or above the 90(th) percentile meet adult WC criteria for the metabolic syndrome (102 cm).WC is a simple, inexpensive measure that can identify children at risk for cardiometabolic disease. A large proportion of U.S. adolescents with elevated WC, and prepubescent girls in particular, currently meet adult cutoff criteria for WC as a component of the metabolic syndrome.Keywords:
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This article outlines the clinical values and limitations of body mass index and waist circumference for nutritional assessment among obese individuals and emphasizes the importance of combining these two parameters for diagnosis of obesity.
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Waist-to-height ratio
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Objective:This study was carried out on groups of different physical condition,exploring the relationship between changes of gene polymorphism and BMI(body mass index)and WC(waist circumference).And on the basis it explores the effect of different levels of physical activity on BMI and the crowd WC.Method:The Han population in northern China in the subjects(age 39~79 years) were assessed for physical activity(PA),and the subjects(subjects are from the same ethnic group)height,weight,waist circumference and other indices were measured.Effects of physical activity on body mass index and waist circumference(WC) were analyzed.Conclusion:The physical activity significantly reduced the effects on BMI and WC.The effect of BMI and WC of the inactive group is greater than the active group.The findings have great in promoting significance public health,which shows that the increase in body mass index and waist circumference can be controlled lifestyle physical activity.
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Body volume index
Chinese population
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Abdominal obesity
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Abstract Body mass index (BMI) is typically used to define overweight and obesity. However, without waist circumference information, BMI may misclassify as overweight or obese. Therefore, we proposed a new index based on BMI. We developed a New Body Mass Index (NBMI) by adding waist circumference (WC) to BMI, which combined BMI and WC. That is, it also combined weight-for-height and waist-to-height ratios. The formula is: NBMI = BMI × WC (m) = WT (kg) / HT (m 2 ) × WC (m) = WT (kg) / HT (m) × WC (m) / HT (m) = weight-for-height × waist-to-height. Firstly, individuals with the same height and weight have the same BMI, but their waist circumferences could vary considerably, and NBMI could distinguish body differences among people's waist sizes. Secondly, NBMI could better identify central obesity than BMI. Thirdly, NBMI could not only measure body mass but also classify health and obesity degrees according to a wide range of scores. Firstly, NBMI incorporating WC could better reflect the body difference in waist size than BMI. Secondly, NBMI is more convenient for identifying central obesity. Thirdly, NBMI could better classify different weight types by expanding the score range.
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Objectives To explore the optimal threshold values of waist circumference(WC)for detecting cardiovascular(CV)risk factors among Chinese children and adolescents.Methods Association of WC with CV risk factors was studied among 65 898 children aged 7-18 years whose data were pooled from nine previous studies in China.CV risk factors in this study included hypertension(blood pressure above 95 percentile levels),dyslipidemia(with one or more of the following three indexes:TG≥1.7 mmol/L,TC≥5.18 mmol/L,and HDL-C≤1.04 mmol/L)and elevated glucose level(fasting plasma glucose ≥5.6 mmol/L).Receive-operating characteristic analysis(ROC)and logistic regression were employed to derive optimal age-and sex-specific waist circumference references for predicting CV risk factors.Results A slight increasing trend of CV risk factors was observed starting from the 75th percentile of waist circumference in the study population,while a remarkable increasing trend occurred from the 90th percentile.The optimal waist circumference thresholds for predicting high blood pressures were at the 75th percentile for both boys and girls,which was at the 90th percentiles for detecting at least two of the above three CV risk factors.In comparison with children with waist circumference below the 75th percentile,the odds ratio of two CV risk factors doubled among children with waist circumference between the 75th and the 90th percentile,and increased by 6 times among children with waist circumference above the 90th percentile.The trend of high blood pressure increasing with waist circumference remained significant after having been stratified by BMI category.Conclusion The 75th and the 90th percentiles of WC are the optimal cut-off points for predicting an increased and a substantially increased risk of CV factors in Chinese children and adolescents,respectively.
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To explore the optimal threshold values of waist circumference (WC) in detecting the risk on cardiovascular (CV) among the Chinese children and adolescents.Association of WC and CV risk factors were studied among 65 898 children and adolescents aged 7 - 18 years whose data were pooled from nine studies carried out in China. Receive-operating characteristic analysis (ROC) and logistic regression were employed to derive optimal age- and sex-specific waist circumference references for predicting the CV risk factors.A slight increasing trend of CV risk factors was observed starting from the 75th percentile of waist circumference in the study population, while a remarkable increasing trend occurred from the 90th percentile. The optimal waist circumference thresholds for predicting high blood pressures were at the 75th percentile for both boys and girls, and at the 90th percentiles it could detect at least two of the above three CV risk factors. In comparison with children whose waist circumference was below the 75th percentile, the odds ratio of two CV risk factors doubled among children with waist circumference between 75th and 90th percentile, and increased by 6 times among children with waist circumference above the 90th percentile. The trend of high blood pressure increasing remained significant with waist circumference after having been stratified by BMI category.The 75th and the 90th percentile of WC appeared to be the optimal cut-off points for predicting an increased and a substantially increased risk of CV factors in Chinese children and adolescents.
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