部分非循环有向图分析老年人膳食营养素对BMD影响

P Dag Analysis of Effects of Daily Nutrition Intake on BMD

目的 用部分非循环有向图分析探讨老年人膳食营养素对骨密度 (BMD)影响。方法 对 30 9例 6 0岁以上老人进行了膳食调查及健康检查 ,男性 132名 ,年龄 6 5 4± 4 0y ,女性 177名 ,年龄 6 6 7± 5 8y。我们作了膳食营养素对骨密度的多元回归分析 ,并进行了因果研究 ,绘制出部分非循环有向图 (简称 pdag)作因果研究。 结果 老年女性BMD显著低于男性。健康老人平均每日摄入钙、蛋白质的量男性均显著高于女性。骨质疏松患者与同性别健康老人每日矿物质摄入量相比 ,OP组钙、蛋白质、VitC摄入量均显著低于同性别健康老人组 ,BMD与钙、蛋白质、VitC均呈显著正相关 ,与dag因果分析一致。结论 膳食营养素与BMD存在一定的关系 ,膳食钙、蛋白质、VitC等摄入量不足可导致BMD降低。

Objective To study the effects of daily mineral intake on bone mineral density(BMD) of old people. Methods The daily nutrition intake and health were investigated in 309 old people aged over 60 years. 132 male, aged 65.4±4.0y,177 female aged 66.7±5.8y.Based on the data, the regression analysis and causal analysis are presented and thus a partial directed acyclic graph (p dag) are plotted to demonstrate a definite causal relation. Results The paper shows that BMD in female were lower than that in male. For healthy people, the daily intake of Calcium, protein, Vitamin C of male was higher than that of healthy female. The daily intake of Calcium, protein, Vitamin C of osteoporosis case was lower than that of healthy people of the same sex. BMD correlation with the daily intake of Calcium, protein, Vitamin C is significantly positive, which is consistent with directed acyclic graph (p dag) analysis.Conclusion It was suggest that there is definite relation between the daily mineral intake and BMD.The lack of daily intake of Calcium, protein, Vitamin C may decrease BMD.