Nigam Priyanka, Misra Anoop, Colles Susan L
Diabetes Foundation India, SDA, New Delhi 110016, India.
Diabetes Metab Syndr. 2013 Apr-Jun;7(2):72-7. doi: 10.1016/j.dsx.2013.02.031. Epub 2013 Mar 14.
Prevalence of obesity is increasing in Asian Indians. Reliable, precise and convenient methods to estimate body composition are required. This study aimed to test the accuracy of bioelectrical impedance analysis (BIA) estimates of body composition among Asian Indians according to two BIA equations--one developed for Asians, the other for Caucasians.
Two hundred apparently healthy Asian Indians (100 males, 100 females; mean age 36.6 ± 7.6 years; mean BMI 16.6-46.7 kg/m(2)) underwent BIA assessment of fat mass (FM), fat free mass (FFM) and percentage body fat (%BF) using Tanita Multi-Frequency Body Composition Analyzer MC-180MA (Tanita Corporation, Tokyo, Japan). One set of BIA values was automatically calculated by the analyzer (Caucasian figures), the other set by Tanita (Japanese Asian figures). Results were compared to dual X-ray absorptiometry (DEXA) as the standard measure.
A moderate level of relative agreement was found between the DEXA-derived measurement of %BF and the estimate from both the Caucasian (r(2)=0.75; p<0.001) and Asian equation (r(2)=0.7; p<0.001). Despite this, the level of absolute agreement was poor, with large bias and wide limits of agreement. According to the Caucasian equation the mean difference between methods was -8.3 ± 3.9 (95% limits of agreement -20.10 to 9.40), for the Asian equations mean difference was -5.4 ± 4.3 (95% limits of agreement -20.63 to 11.41).
When compared to DEXA, the current Asian and Caucasian Tanita formulae significantly under-estimate the %BF of Asian Indians.
亚洲印度人的肥胖患病率正在上升。需要可靠、精确且便捷的方法来估计身体成分。本研究旨在根据两个生物电阻抗分析（BIA）方程——一个是为亚洲人开发的，另一个是为高加索人开发的，来测试BIA对亚洲印度人身体成分估计的准确性。
200名表面健康的亚洲印度人（100名男性，100名女性；平均年龄36.6±7.6岁；平均BMI 16.6 - 46.7kg/m²）使用日本东京Tanita公司的MC - 180MA多频身体成分分析仪接受了BIA对脂肪量（FM）、去脂体重（FFM）和体脂百分比（%BF）的评估。分析仪自动计算出一组BIA值（高加索人数据），另一组由Tanita计算（日本亚洲人数据）。结果与作为标准测量方法的双能X线吸收法（DEXA）进行比较。
在DEXA得出的%BF测量值与来自高加索人方程（r² = 0.75；p < 0.001）和亚洲人方程（r² = 0.7；p < 0.001）的估计值之间发现了中等程度的相对一致性。尽管如此，绝对一致性水平较差，偏差较大且一致性界限较宽。根据高加索人方程两方法之间的平均差异为 - 8.3±3.9（95%一致性界限 - 20.10至9.40），对于亚洲人方程平均差异为 - 5.4±4.3（95%一致性界限 - 20.63至11.41）。
与DEXA相比，当前的亚洲人和高加索人Tanita公式显著低估了亚洲印度人的%BF。
