Ogden Cynthia L, Li Yan, Freedman David S, Borrud Lori G, Flegal Katherine M
Division of Health and Nutrition Examination Surveys, National Center for Health Statistics, Hyattsville, MD 20782, USA.
Natl Health Stat Report. 2011 Nov 9(43):1-7.
The high prevalence of obesity (defined by body mass index) among children and adolescents in the United States and elsewhere has prompted increased attention to body fat in childhood and adolescence.
This report provides smoothed estimates of major percentiles of percentage body fat for boys and girls aged 8-19 years in the United States.
Percentage body fat was obtained from whole-body, dual-energy x-ray absorptiometry (DXA) scans conducted during the 1999-2004 National Health and Nutrition Examination Survey. A nonparametric double-kernel method was employed to smooth percentile curves for the DXA data.
The pattern of body fat development differs between boys and girls aged 8-19 years. In most age groups, girls have a higher percentage of body fat than boys. Among boys, there is a drop in body fat percentage in early adolescence that is especially pronounced at the higher percentiles. Among girls this pattern is not seen; percentage body fat increases slightly with age.
These results provide a smoothed reference distribution of percentage body fat for U.S. children and adolescents aged 8-19 years.
美国及其他地区儿童和青少年中肥胖（以体重指数定义）的高患病率促使人们对儿童期和青春期的体脂给予更多关注。
本报告提供了美国8至19岁男孩和女孩体脂百分比主要百分位数的平滑估计值。
体脂百分比数据来自1999 - 2004年国家健康和营养检查调查期间进行的全身双能X线吸收测定（DXA）扫描。采用非参数双核方法对DXA数据的百分位数曲线进行平滑处理。
8至19岁男孩和女孩的体脂发育模式不同。在大多数年龄组中，女孩的体脂百分比高于男孩。在男孩中，青春期早期体脂百分比下降，在较高百分位数时尤为明显。在女孩中未观察到这种模式；体脂百分比随年龄略有增加。
这些结果为美国8至19岁儿童和青少年的体脂百分比提供了一个平滑的参考分布。
