模拟身体脂肪和身体质量指数之间的关系。

T C Mills, D Gallagher, J Wang, S Heshka
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摘要

目的:鉴于全球范围内对肥胖水平的关注日益增加,本文分析了最常见的肥胖指数BMI与体脂水平之间的关系。研究方法和程序:使用一个可以按种族、性别和年龄分类的大型数据集,从功能形式的角度分析体脂和BMI之间的统计关系。结果:不论种族,男性体脂与BMI呈线性相关,年龄以对数形式进入,对体脂有正向影响。无论年龄大小,白人男性的体脂含量都较高,但非裔美国男性的体脂含量随年龄增长的速度要快于亚洲人和西班牙人。年龄不是女性体脂的重要预测因素,除了亚洲人,女性体脂和BMI之间的关系是非线性的。白人女性的体脂预期高于其他种族,除了bmi较低时,亚洲女性的体脂预期最高。讨论:使用身体质量指数来预测身体脂肪应该谨慎,因为这种预测取决于种族、性别和年龄,可能相对不精确。鉴于BMI值在不同人群中对应不同的肥胖水平,该研究结果对当前关于超重和肥胖的标准BMI临界值是否适用于所有性别和种族群体的争论具有实际意义。
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Modelling the relationship between body fat and the BMI.

OBJECTIVE: Given the increasing concerns about the levels of obesity being reached throughout the world, this paper analyses the relationship between the most common index of obesity, the BMI, and levels of body fat. RESEARCH METHODS AND PROCEDURES: The statistical relationship, in terms of functional form, between body fat and BMI is analysed using a large data set which can be categorized by race, sex and age. RESULTS: Irrespective of race, body fat and BMI are linearly related for males, with age entering logarithmically and with a positive effect on body fat. Caucasian males have higher body fat irrespective of age, but African American males' body fat increases with age faster than that of Asians and Hispanics. Age is not a significant predictor of body fat for females, where the relationship between body fat and BMI is nonlinear except for Asians. Caucasian females have higher predicted body fat than other races, except at low BMIs, where Asian females are predicted to have the highest body fat. DISCUSSION: Using BMIs to make predictions about body fat should be done with caution, as such predictions will depend upon race, sex and age and can be relatively imprecise. The results are of practical importance for informing the current debate on whether standard BMI cut-off values for overweight and obesity should apply to all sex and racial groups given that these BMI values are shown to correspond to different levels of adiposity in different groups.

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