Spinoza Evelyn Dearo, Fonte Flavia Kurebayashi, Carvalho Vanessa Amarante, Dos Santos Regiane Aparecida, Colleoni Gisele W B, Cendoroglo Maysa Seabra
Discipline of Geriatrics and Gerontology, Department of Medicine, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil.
Ann Geriatr Med Res. 2024 Sep;28(3):284-290. doi: 10.4235/agmr.24.0008. Epub 2024 May 17.
Anthropometry and body mass index (BMI) do not assess body composition or its distribution in older adults; thus, individuals may have different fat percentages but similar BMI values. The body adiposity index (BAI) was recently proposed as a feasible and inexpensive method for estimating the percentage of body fat based on measurements of hip circumference and height. The present study evaluated whether BAI and BMI are useful alternatives to dual-energy X-ray absorptiometry (DXA), which is rarely used in clinical practice, for predicting body fat in independent long-lived older adults.
In this cross-sectional study, we used DXA to calculate the percentage of body fat, which was compared with BAI and BMI values. We performed Pearson correlation analyses and used Cronbach's alpha, described by Bland and Altman, to compare the reliability between the indexes.
Among 157 evaluated individuals (73.2% women, mean age 87±3.57 years), men had a lower percentage of total fat, as assessed by DXA, and lower BAI indices than women. The correlation between BAI and DXA was moderate (r=0.59 for men and r=0.67 for women, p<0.001). We confirmed the reliability based on Cronbach's alpha coefficients of 0.67 in men and 0.77 in women. We also observed that the BAI was strongly positively correlated with BMI in both men and women.
The BAI, used in combination with BMI, can be an alternative to DXA for the assessment of body fat in the oldest old in clinical practice, mainly women, and can be used to add information to BMI.
人体测量学和体重指数（BMI）无法评估老年人的身体成分或其分布情况；因此，个体可能有不同的脂肪百分比，但BMI值相似。身体肥胖指数（BAI）最近被提出作为一种基于臀围和身高测量来估计体脂百分比的可行且廉价的方法。本研究评估了BAI和BMI是否可作为双能X线吸收法（DXA，临床实践中很少使用）的有用替代方法，用于预测独立生活的长寿老年人的体脂情况。
在这项横断面研究中，我们使用DXA计算体脂百分比，并将其与BAI和BMI值进行比较。我们进行了Pearson相关性分析，并使用Bland和Altman描述的Cronbach's alpha来比较各指标之间的可靠性。
在157名接受评估的个体中（73.2%为女性，平均年龄87±3.57岁），通过DXA评估，男性的总脂肪百分比更低，BAI指数也低于女性。BAI与DXA之间的相关性为中等（男性r = 0.59，女性r = 0.67，p<0.001）。我们基于男性Cronbach's alpha系数为0.67、女性为0.77证实了其可靠性。我们还观察到，男性和女性的BAI与BMI均呈强正相关。
在临床实践中，BAI与BMI联合使用，可作为评估高龄老年人（主要是女性）体脂的DXA替代方法，并可为BMI补充信息。
