Self-reported and measured weight, height and body mass index for the diagnosis of the nutritional status in people living with HIV/AIDS

ABSTRACT Objective To validate self-reported weight and height data for people living with HIV/AIDS. Methods This cross-sectional study involved 481 people living with HIV/AIDS seen at a reference unit in João Pessoa, state of Paraíba, Brazil, between September and December 2015, 99 (20.5%) of whom had their weight and height measured. The intraclass correlation coefficient was calculated to determine the relationship between the self-reported and measured weight, height and body mass index values, and linear regression analysis was used to generate equations to predict weight and height. It were significant p-value under 5% for statistic tests applied. Results In the sample with measured values, 57.6% of men, with a mean age of 44 years old and a mean income per capita equivalent to US$145.50, high correlations (r>0.90) between the self-reported and measured values for weight, height and body mass index were observed. The accuracy was 92.6%, and the Kappa coefficient was greater than 0.85. Women tended to underestimate weight and overestimate height. The men overestimated weight and underestimated height. The intraclass correlation coefficients were greater than 0.95. Conclusion The use of self-reported measures of weight, height and body mass index for nutritional assessment of people living with HIV/AIDS is valid and must be considered for similar populations when time and resources are limiting factors.

摘要
目的：验证人类免疫缺陷病毒（Human Immunodeficiency Virus, HIV）/获得性免疫缺陷综合征（Acquired Immune Deficiency Syndrome, AIDS）感染者自我报告的体重与身高数据的有效性。
方法：本横断面研究（cross-sectional study）于2015年9月至12月间，在巴西帕拉伊巴州若昂佩索阿的一家转诊医疗机构纳入了481名HIV/AIDS感染者，其中99名（占比20.5%）受试者接受了体重与身高的实测。研究通过组内相关系数（intraclass correlation coefficient）分析自我报告与实测的体重、身高及体质量指数（Body Mass Index, BMI）之间的相关性，并采用线性回归分析（linear regression analysis）构建体重与身高的预测方程。本研究所有统计检验均以P值小于5%作为统计学显著性判定标准。
结果：在接受实测的受试者样本中，男性占比57.6%，平均年龄为44岁，人均收入约合145.50美元。结果显示，受试者自我报告与实测的体重、身高及体质量指数均呈较高相关性（r>0.90）；预测准确率达92.6%，Kappa系数（Kappa coefficient）大于0.85。女性受试者倾向于低估体重、高估身高，男性受试者则倾向于高估体重、低估身高。组内相关系数均大于0.95。
结论：采用自我报告的体重、身高及体质量指数数据用于HIV/AIDS感染者的营养评估具有有效性，当时间与资源受限的情况下，该方法可推广应用于同类研究人群。