Objective: To understand the current status of BMI of the elderly and related factors in longevity areas in China, and provide scientific evidence for the control of BMI level in elderly population. Methods: Data used in this study were obtained from Healthy Aging and Biomarkers Cohort Study, a sub-cohort of the Chinese Longitudinal Healthy Longevity Survey. A total of 2 825 elderly in 8 longevity areas in China were surveyed and measured in 2017. The BMI levels of 2 217 elderly aged 65 years and older were calculated and in follow up. The ordered classification logistic regression model was used to analyze the influencd factors for the BMI in the elderly. Results: The BMI of the elderly in 8 longevity areas in China was (22.36±3.87) kg/m(2), and it was (22.76±3.58) kg/m(2) for males and (21.75±3.98) kg/m(2) for females. The BMI levels were normal in 1 165 elderly persons. The prevalence of underweight, overweight and obesity were 15.8%, 24.0% and 7.7%, respectively. Multivariate analysis showed that the main factors affecting the BMI of people under 100- years old were age (65-: OR=2.78, 95%CI: 1.87-4.15; 80-: OR=1.47, 95%CI: 1.00-2.17), smoking status (OR=0.46, 95%CI: 0.32-0.66), annual household income (<30 000 Yuan: OR=1.26, 95%CI: 1.07-1.47; 30 000-70 000 Yuan: OR=1.52, 95%CI: 1.12-1.86), and frequency of tea intake(OR=1.36, 95%CI: 1.01-1.71), while the factor in people aged ≥100 years was gender (OR=3.68, 95%CI: 1.32-10.36). Conclusions: The prevalence of underweight, overweight and obesity were high in the elderly from longevity areas in China. It is necessary to pay attention to the trend of overweight and obesity due to smoking, higher annual household income and regular tea drinking in the elderly men.
目的： 研究我国长寿地区老年人BMI水平及其影响因素，为控制老年人群BMI水平提供科学依据。 方法： 数据来源于"中国老年健康影响因素跟踪调查"子队列-"老年健康生物标志物队列研究"，于2017年选取我国8个长寿地区对2 825名老年人进行了问卷调查、身体测量等，其中≥65岁老年人2 217名。计算其BMI水平并采用有序分类logistic回归模型分析老年人BMI影响因素。 结果： 我国8个长寿地区老年人BMI水平为（22.36±3.87）kg/m(2)，其中男性为（22.76±3.58）kg/m(2)，女性为（21.75±3.98）kg/m(2)；BMI处于正常范围老年人1 165名（52.5%），超重532名（24.0%），体重过低351名（15.8%），肥胖人数最少，为169名（7.7%）。多因素分析结果显示，影响百岁以下老年人BMI水平的主要因素依次为年龄（65~岁：OR=2.78，95%CI：1.87~4.15；80~岁：OR=1.47，95%CI：1.00~2.17）、吸烟（OR=0.46，95%CI：0.32~0.66）、家庭年收入（<3万元：OR=1.26，95%CI：1.07~1.47；3~7万元：OR=1.52，95%CI：1.12~1.86）以及茶摄入频率（OR=1.36，95%CI：1.01~1.71）；百岁及以上老年人BMI水平的主要影响因素为性别（OR=3.68，95%CI：1.32~10.36）。 结论： 我国长寿地区老年人体重过低、超重及肥胖水平均较高，同时吸烟、较高家庭年收入、男性以及经常饮茶老年人群超重、肥胖水平降低趋势也应该引起人们重视。.
Keywords: Body mass index; Elderly; Longevity.