Percent body fat equations for the United States Population

描述（由申请人提供）：本研究利用了具有全国代表性的1999- 2004年全国健康和营养检查调查（NHANES）中使用双发射X射线吸收测定法（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，2个生物电阻抗（BIA）和人口统计学变量来生成方程的研究，该方程将使研究人员能够使用在广泛的现场环境中收集的变量来计算儿童和成人体脂百分比的有效测量值。 大多数以前的方程开发来预测身体脂肪百分比使用人体测量学和BIA计算使用较小的样本组装方便，往往非常有限的种族/民族和年龄的多样性。 我们的具体目标是：目标1：创建和验证针对青年和成年人的性别特定方程，以估计多样化的全国代表性样本中的体脂百分比。目标2：生成比最优方程具有更少变量的方程。这些方程将预测研究人员的需求，他们可以或有机会收集有限数量的变量。目标3：生成排除两个BIA变量或两个皮褶变量的方程。由于BIA的性能和皮褶的收集在设备和培训方面比其他措施更昂贵，我们将提供排除它们的方程。目标4：通过出版物、网站和应用软件（app）传播已开发的体脂百分比方程，使其易于获得并易于对研究人员、临床医生和公众有用。 这项工作使用了一个合格的调查人员团队，利用NHANES现有数据的价值，产生可推广到美国儿童和成人的体脂百分比方程。

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.