目的探讨老年人植物性饮食与死亡之间的关系。方法基于中国老年健康和家庭幸福调查(Chinese Longitudinal Healthy Longevity and Happy Family Study,CLHLS-HF)数据,分析15300份样本在2008―2018年随访调查资料。以植物性饮食指数(plan...目的探讨老年人植物性饮食与死亡之间的关系。方法基于中国老年健康和家庭幸福调查(Chinese Longitudinal Healthy Longevity and Happy Family Study,CLHLS-HF)数据,分析15300份样本在2008―2018年随访调查资料。以植物性饮食指数(plant-based diet index,PDI)、不健康的植物性饮食指数(unhealthy plant-based diet index,UPDI)作为评估植物性饮食情况的指标,分别按五分位数分组,分为Q1、Q2、Q3、Q4、Q5共5组。采取Cox回归分析构建模型,研究PDI、UPDI对于65岁及以上老年人死亡的影响。结果调整人口学特征、健康行为和基础疾病混杂因素后,PDI与死亡存在统计学关联(P<0.001),以Q1为对照组,Q3(HR=0.900,95%CI:0.832~0.974)、Q4(HR=0.872,95%CI:0.804~0.947)、Q5组(HR=0.779,95%CI:0.715~0.850)人群死亡风险分别减少10.00%、12.80%、22.10%,Q2组差异无统计学意义;UPDI与死亡存在统计学关联(P<0.001),相较Q1组,Q3(HR=1.182,95%CI:1.080~1.294)、Q4(HR=1.206,95%CI:1.101~1.321)、Q5组(HR=1.210,95%CI:1.104~1.327)人群死亡风险分别增加18.20%、20.60%、21.00%,Q2组差异无统计学意义。随着PDI分数的上升,人群死亡风险呈下降的趋势;随着UPDI分数的上升,人群死亡风险呈上升的趋势(均P趋势<0.001)。结论基于CLHLS-HF人群可知,减少植物性食物尤其是健康的植物性食物摄入频率会增加老年人死亡的风险。展开更多
He defect properties in Sc, Y, Gd, Tb, Dy, Ho, Er and Lu were studied using first-principles calculations based on density functional theory. The results indicate that the formation energy of an interstitial He atom i...He defect properties in Sc, Y, Gd, Tb, Dy, Ho, Er and Lu were studied using first-principles calculations based on density functional theory. The results indicate that the formation energy of an interstitial He atom is smaller than that of a substitutional He atom in all hcp rare-earth metals considered. Furthermore, the tetrahedral interstitial position is more favorable than an octahedral position for He defects. The results are compared with those from bcc and fcc metals.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 10976007)the Fundamental Research Funds for the Central Universities (Grant No. ZYGX2009J040)+1 种基金the Science and Tech-nology Foundation of China Academy of Engineering Physics (Grant No. 2009A0301015)the US Department of Energy, Office of Fusion En-ergy Science (Grant No. DE-AC06-76RLO 1830)
文摘He defect properties in Sc, Y, Gd, Tb, Dy, Ho, Er and Lu were studied using first-principles calculations based on density functional theory. The results indicate that the formation energy of an interstitial He atom is smaller than that of a substitutional He atom in all hcp rare-earth metals considered. Furthermore, the tetrahedral interstitial position is more favorable than an octahedral position for He defects. The results are compared with those from bcc and fcc metals.
