【目的】探讨长沙市健康体检人员的体质量指数（BMI）对血压与血脂的影响，为预防与控制血压及血脂异常提供依据。【方法】随机选择400例来自长沙市在湘雅医院参加健康体检的成人，按BM I不同将研究对象分为体重过轻组、正常组、超重组...【目的】探讨长沙市健康体检人员的体质量指数（BMI）对血压与血脂的影响，为预防与控制血压及血脂异常提供依据。【方法】随机选择400例来自长沙市在湘雅医院参加健康体检的成人，按BM I不同将研究对象分为体重过轻组、正常组、超重组和肥胖组，采用单因素logistic回归及多因素logistic回归分析BM I对血压与血脂的影响。【结果】体质量过轻组高血压、高血脂患病率低于正常组，而超重组和肥胖组高血压、高血脂患病率明显高于正常组，且差异均有统计学意义（均 P ＜00．5）。单因素logistic回归结果显示，超重组与肥胖组高血压、高血脂的患病风险显著高于正常组，差异均具有统计学意义（均 P ＜00．5）；多因素logistic回归结果显示，超重组与肥胖组高血压、高血脂的患病风险显著高于正常组，差异均具有统计学意义（均 P ＜00．5）；年龄仅对是否患高血压有显著影响，差异具有统计学意义（ P ＜00．5）；对是否患高血脂并无显著影响（ P ＞00．5）。【结论】超重或肥胖是高血压、高血脂患病的危险因素，应加强相关的健康教育工作。展开更多
The subject of this work is to propose adaptive finite element methods based on an optimal maximum norm error control estimate.Using estimators of the local regularity of the unknown exact solution derived from comput...The subject of this work is to propose adaptive finite element methods based on an optimal maximum norm error control estimate.Using estimators of the local regularity of the unknown exact solution derived from computed approximate solutions,the proposed procedures are analyzed in detail for a non-trivial class of corner problems and shown to be efficient in the sense that they generate the correct type of refinement and lead to the desired control under consideration.展开更多
An adaptive finite element procedure designed for specific computational goals is presented,using mesh refinement strategies based on optimal or nearly optimal a priori error estimates for the finite element method an...An adaptive finite element procedure designed for specific computational goals is presented,using mesh refinement strategies based on optimal or nearly optimal a priori error estimates for the finite element method and using estimators of the local regularity of the unknown exact solution derived from computed approximate solutions.The proposed procedure is analyzed in detail for a non-trivial class of corner problems and shown to be efficient in the sense that the method can generate the correct type of refinements and lead to the desired control under consideration.展开更多
文摘【目的】探讨长沙市健康体检人员的体质量指数（BMI）对血压与血脂的影响，为预防与控制血压及血脂异常提供依据。【方法】随机选择400例来自长沙市在湘雅医院参加健康体检的成人，按BM I不同将研究对象分为体重过轻组、正常组、超重组和肥胖组，采用单因素logistic回归及多因素logistic回归分析BM I对血压与血脂的影响。【结果】体质量过轻组高血压、高血脂患病率低于正常组，而超重组和肥胖组高血压、高血脂患病率明显高于正常组，且差异均有统计学意义（均 P ＜00．5）。单因素logistic回归结果显示，超重组与肥胖组高血压、高血脂的患病风险显著高于正常组，差异均具有统计学意义（均 P ＜00．5）；多因素logistic回归结果显示，超重组与肥胖组高血压、高血脂的患病风险显著高于正常组，差异均具有统计学意义（均 P ＜00．5）；年龄仅对是否患高血压有显著影响，差异具有统计学意义（ P ＜00．5）；对是否患高血脂并无显著影响（ P ＞00．5）。【结论】超重或肥胖是高血压、高血脂患病的危险因素，应加强相关的健康教育工作。
文摘The subject of this work is to propose adaptive finite element methods based on an optimal maximum norm error control estimate.Using estimators of the local regularity of the unknown exact solution derived from computed approximate solutions,the proposed procedures are analyzed in detail for a non-trivial class of corner problems and shown to be efficient in the sense that they generate the correct type of refinement and lead to the desired control under consideration.
文摘An adaptive finite element procedure designed for specific computational goals is presented,using mesh refinement strategies based on optimal or nearly optimal a priori error estimates for the finite element method and using estimators of the local regularity of the unknown exact solution derived from computed approximate solutions.The proposed procedure is analyzed in detail for a non-trivial class of corner problems and shown to be efficient in the sense that the method can generate the correct type of refinements and lead to the desired control under consideration.
