The Abilities of Body Mass Index and Skinfold Thicknesses to Identify Children with Low or Elevated Levels of Dual-Energy X-Ray Absorptiometry?Determined Body Fatness

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• 作者：David S. Freedman ; PhD¹ ; ^dxf1@cdc.gov ; Cynthia L. Ogden ; PhD² ; Heidi M. Blanck¹ ; Lori G. Borrud ; Dr PH² ; William H. Dietz ; PhD ; MD¹
• 关键词：BMI ; Body mass index ; CDC ; Centers for Disease Control and Prevention ; DXA ; Dual-energy X-ray absorptiometry ; NCHS ; National Center for Health Statistics ; NHANES ; National Health and Nutrition Examination Survey ; PBFDXA ; Percent body fat determined by dua
• 刊名：The Journal of Pediatrics
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：163
• 期：1
• 页码：160-166.e1
• 全文大小：330 K

文摘

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lass=""h4"">Objective

To examine the accuracies of body mass index (BMI) and skinfold thicknesses in classifying the body fatness of 7365 8- to 19-year-old subjects in a national sample.

lass=""h4"">Study design

We used percent body fat determined by dual-energy x-ray absorptiometry (PBF_DXA) between 1999 and 2004. Categories of PBF_DXA and the skinfold sum (triceps plus subscapular) were constructed so that that numbers of children in each category were similar to the number in each of 5 BMI categories based on the Centers for Disease Control and Prevention growth charts.

lass=""h4"">Results

Approximately 75 % of the children and adolescents who had a BMI-for-age ¡Ý 95th percentile (considered obese) had elevated body fatness, but PBF_DXA levels were more variable at lower BMIs. For example, only 41 % of the boys who had a BMI < 25th percentile, had a similarly low PBF_DXA. The use of the skinfold sum, rather than BMI, slightly improved the identification of elevated levels of body fatness among boys (P = .03), but not among girls (P > .10). A low sum of the triceps and subscapular skinfold thicknesses was a better indicator of low PBF_DXA than was a low BMI, but differences were smaller among children with greater levels of body fatness. Among girls who had a PBF_DXA above the median, for example, BMI and the skinfold sum were correlated similarly (r = 0.77-0.79) with body fatness.

lass=""h4"">Conclusions

Both BMI and skinfold thicknesses are fairly accurate in identifying children who have excess body fatness. In contrast, if the goal is to identify children who have low body fatness, skinfold thicknesses would be preferred.