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Percent body fat prediction equations: external validity and race/ethnicity.

机译：身体脂肪预测百分比公式：外部有效性和种族/民族。

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Dear Editor-in-Chief: The recent article by O'Connor et al. (2) addressed an important topic to improve the accuracy of percent body fat (BF%) prediction by anthropometric data in US minority groups. I want to raise two issues in interpreting the study results. First, because the purpose of their study was to develop accurate anthropometric models to estimate BF% that can be generalized to ethnically diverse young adults, representative sampling is critical to achieve the purpose (for external validity). I disagree with the authors' justification for the representativeness of their study sample, which is that their study sample is "reasonably representative of the US population of young adults" because the prevalence of overweight or obesity in the sample is similar with that from national survey data (p. 1964). The composition of race/ethnicity in their study sample differed from the US population of young adults; for example, Asians represented 45% of their study participants versus 4.9% of the 2004 US census participants age 20-39 years. The prevalence of overweight or obesity (body mass index (BMI) >=25 kg.m~(-2)) varies by race/ethnicity (59.3% and 49.2% for non-Hispanic white men and women, respectively; 72.6% and 69.3% for Hispanic men and women, respectively) (3), with a particularly low prevalence in Asians (38.5% for men and 20.8% for women; unpublished data from the 2004 Behavioral Risk Factor Surveillance System (BRFSS)). Therefore, it is not meaningful to compare the prevalence from their study sample and a national survey, and the similarity in the prevalence does not support the representativeness of their sample.
机译：尊敬的总编辑：O'Connor等人的最新文章。 （2）解决了一个重要的课题，即通过美国少数群体的人体测量数据来提高人体脂肪百分比（BF％）预测的准确性。我想在解释研究结果时提出两个问题。首先，由于他们的研究目的是开发准确的人体测量模型以估计BF％，可以将其推广到不同种族的年轻成年人，因此有代表性的抽样对于实现该目的（对于外部有效性）至关重要。我不同意作者对他们的研究样本的代表性的辩解，因为他们的研究样本“合理地代表了美国的年轻人口”，因为样本中超重或肥胖的患病率与国家调查的相似数据（p.1964）。他们的研究样本中的种族/民族成分与美国的年轻人不同。例如，亚洲人占研究参与者的45％，而2004年美国年龄在20-39岁的人口普查参与者则占4.9％。超重或肥胖的发生率（体重指数（BMI）> = 25 kg.m〜（-2））因种族/民族而异（非西班牙裔白人男女分别为59.3％和49.2％; 72.6％和西班牙裔男性和女性分别为69.3％（3），亚洲人的患病率特别低（男性38.5％，女性20.8％; 2004年行为危险因素监视系统（BRFSS）未发布的数据）。因此，将他们的研究样本和全国调查的患病率进行比较是没有意义的，并且患病率的相似性并不支持他们样本的代表性。

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