相位角在预测社区长寿老人营养不良中的应用价值

Application value of phase angle in predicting malnutrition in community-dwelling long-lived older adults

中文关键词: 相位角  长寿老人  营养不良  微型营养评定  生物电阻抗分析法

英文关键词: phase anglelong-lived older adultsmalnutritionmini-nutritional assessmentbioelectrical impedance analysis

中文摘要:

      目的 探讨相位角(PhA)在评估社区长寿老人营养不良中的应用价值.方法 采用横断面研究设计,于2022 年9 月至2024 年10 月纳入上海市崇明区302 例社区长寿老人(年龄≥90 岁).收集一般资料、营养指标,并测量PhA及骨骼肌质量(SMM).以微型营养评定(MNA)作为营养不良诊断标准,评估PhA与传统营养指标的相关性及PhA对营养不良的独立预测效能.结果 302 例研究对象年龄90～99 岁,平均年龄(92.11±2.26)岁,依据MNA诊断的营养不良患病率为22.52%(68/302).营养不良组的PhA、体重指数(BMI)、血清白蛋白(ALB)及SMM均低于非营养不良组(P＜0.01).PhA与MNA评分、BMI、ALB及SMM均呈正相关(P＜0.01).校正年龄、性别、BMI、ALB及SMM后,多因素Logistic 回归分析显示,PhA与营养不良呈独立负相关(OR=0.164,95%CI:0.079～0.339).受试者操作特征曲线显示,PhA预测营养不良的曲线下面积为0.814(95%CI:0.752～0.876),最佳截断值为3.15°,正确诊断指数为0.445,灵敏度为82.00%,特异度为62.50%.结论 在社区长寿老人中,PhA对营养不良具有较好的预测效能,其截断值3.15°可能为该人群的营养不良筛查提供参考.

英文摘要:

      Objective To investigate the application value of phase angle(PhA)in assessing malnutrition in community-dwelling long-lived older adults.Methods A cross-sectional study was conducted.302 community-dwelling long-lived older adults(aged≥90 years)were enrolled from Chongming District,Shanghai,between September 2022 and October 2024.Their general information and nutritional indicators were collected.PhA and skeletal muscle mass(SMM)were measured.The mini-nutritional assessment(MNA)was used as the diagnostic criterion for malnutrition.The correlation between PhA and traditional nutritional indicators was analyzed,and the independent predictive performance of PhA for malnutrition was evaluated.Results The participants were aged 90-99 years,with a mean age of(92.11±2.26)years.The prevalence of malnutrition based on MNA criteria was 22.52%(68/302).The PhA,body mass index(BMI),serum albumin(ALB),and SMM in the malnutrition group were all lower than those in the non-malnutrition group(P＜0.01).PhA was positively correlated with MNA score,BMI,ALB,and SMM(P＜0.01).After adjusting for age,gender,BMI,ALB,and SMM,multivariate Logistic regression analysis showed that PhA remained independently and negatively correlated with malnutrition(OR=0.164,95%CI:0.079-0.339).Receiver operator characteristic curve analysis revealed that the area under the curve(AUC)of PhA in predicting malnutrition was 0.814(95%CI:0.752-0.876).The optimal cutoff value was 3.15°,with a Youden index of 0.445,sensitivity of 82.00%,and specificity of 62.50%.Conclusion In the community-dwelling long-lived older adults,PhA exhibits favorable predictive performance for malnutrition.Its cut-off value of 3.15° may serve as a reference for malnutrition screening in this population.