Percent body fat equations for the United States Population

描述(由申请人提供)：这项研究利用了在1999-2004年具有全国代表性的国家健康和营养检查调查(NHANES)中使用双发射X射线吸收法(DXA)准确测量体脂百分比所提供的独特机会。这将是第一项使用收集的10个人体测量学、2个生物电阻抗(BIA)和人口统计学变量来产生方程的研究，这些方程将使研究人员能够使用在广泛的现场环境中可行的变量来计算儿童和成人的有效体脂百分比。 以前开发的使用人体测量学和BIA预测身体脂肪百分比的公式大多是使用方便组装的较小样本计算的，而且往往在种族/民族和年龄多样性方面非常有限。我们的具体目标是：目标1：为年轻人和成年人创建和验证特定性别的方程，以估计不同的、具有全国代表性的样本中的体脂百分比。目标2：生成变量数连续少于最优方程的方程。这些方程式将预测那些仅有或有机会收集有限数量变量的研究人员的需求。目标3：生成不包括两个BIA变量或两个皮肤折叠变量的方程。由于执行BIA和收集皮褶在设备和培训方面的成本比其他措施更高，我们将提供排除它们的公式。目的4：通过出版物、网站和应用软件(APP)传播开发的体脂百分比公式，使研究人员、临床医生和公众能够轻松获得和使用这些公式。这项工作使用了一支资质良好的调查团队，利用来自NHANES的现有数据的价值，得出可推广到美国儿童和成年人的体脂百分比公式。

DESCRIPTION (provided by applicant): This research takes advantage of the unique opportunity presented by the accurate measurement of percent body fat using Dual-emission X-ray absorptiometry (DXA) in the nationally representative 1999- 2004 National Health and Nutrition Examination Survey (NHANES). This will be the first study to use the 10 anthropometric, 2 bioelectric impedance (BIA) and demographic variables collected to produce equations that will enable investigators to calculate valid measurements of percent body fat in children and adults using variables that are feasible to collect in a wide range of field settings. Most previous equations developed to predict percent body fat using anthropometrics and BIA were calculated using smaller samples assembled by convenience and often very limited in race/ethnic and age diversity. Our specific aims are: Aim 1: Create and validate gender-specific equations for youth and adults to estimate percent body fat in a diverse, nationally representative sample. Aim 2: Generate equations with successively smaller numbers of variables than the optimal equations. These equations will anticipate the needs of researchers who have available or have the opportunity to collect only a limited number of variables. Aim 3: Generate equations that exclude either the two BIA variables or the two skinfold variables. Since performance of BIA and collection of skinfolds are more costly in terms of equipment and training than other measures, we will provide equations from which they are excluded. Aim 4: Disseminate the developed percent body fat equations through publications and a website and application software (app) that makes them readily available and easily useful to researchers, clinicians and the public. This work uses a well-qualified team of investigators to leverage the value of extant data from NHANES to produce percent body fat equations that are generalizable to American children and adults.