PDF(Pubmed)
Abstract：
Obesity is defined as excess adipose tissue; however, commonly used methods may under-detect adiposity in adolescents. This study compared the performance of body mass index percentile (BMI%) and relative body mass index (RBMI) in identifying excess body fat percentage (BF%) and estimated RBMI cut points to better stratify severity of adiposity. In 567 adolescents ages 11-19 year, BF% measured by DXA was used to compare BMI% and RBMI performance at different degrees of adiposity. RBMI cut points for adiposity detection were derived via ROC curve analysis. BF% was strongly correlated with BMI% (r = 0.889, p < 0.001) and RBMI (r = 0.901, p < 0.001). However, RBMI exhibited less dispersion and better discriminated the relationship with BF% independent of age, race, and gender. Both BMI% and RBMI performed similarly for detecting high BF% (≥25 BF% in males; ≥30 BF% in females). Nonetheless, the relationship of BMI% with BF% was diminished among leaner adolescents. RBMI detected overweight in 21.3% more females and 14.2% more males. RBMI improved the detection of excess adiposity in individuals otherwise classified as having normal weight or overweight by BMI%. RBMI is a valuable and accessible tool for earlier detection, intervention, and effective follow-up of excess adiposity in youth at higher risk for complications.
摘要：
肥胖被定义为过量的脂肪组织；然而，常用的方法可能对青少年肥胖的检测不足.这项研究比较了体重指数百分位数（BMI％）和相对体重指数（RBMI）在确定多余的体脂百分比（BF％）和估计的RBMI切点方面的表现，以更好地对肥胖的严重程度进行分层。在567名11-19岁的青少年中，通过DXA测量的BF％用于比较不同肥胖程度下的BMI％和RBMI表现。通过ROC曲线分析得出用于肥胖检测的RBMI切点。BF％与BMI％（r=0.889，p<0.001）和RBMI（r=0.901，p<0.001）密切相关。然而,RBMI表现出更少的离散度，更好地区分了与BF％的关系，而与年龄无关，种族,和性别。BMI％和RBMI在检测高BF％（男性≥25BF％；女性≥30BF％）方面的表现相似。尽管如此，在较瘦的青少年中,BMI%与BF%的关系减弱.RBMI检测到超重的女性增加了21.3％，男性增加了14.2％。RBMI提高了对体重正常或体重超重的个体肥胖的检测。RBMI是早期检测的有价值且可访问的工具，干预，并对并发症风险较高的青少年过度肥胖进行有效随访。
