中国老年人衰弱状况及其影响因素分析

目的 分析中国老年人衰弱状况及其影响因素,为制定干预措施提供借鉴。方法 利用中国健康与养老追踪调查2011－2015年全国随访调查数据,以衰弱指数（FI）评价≥60岁老年人的衰弱状况。使用logistic回归分析进行影响老年人衰弱患病率的多因素分析。结果 中国老年人2011、2013、2015年的衰弱患病率分别为18.7%、20.6%和28.4%。女性、高龄的老年人FI更高。髋关节骨折、跌倒、饮酒>1次/月及不参加社会活动可能是衰弱的危险因素。结论 中国老年人衰弱患病率较高,且呈逐年上升的趋势。衰弱受不良事件和生活方式等多种因素的影响,应及早采取综合干预策略,延缓衰弱进程。     

Midwifery care for women with human immunodeficiency virus disease in pregnancy: A demonstration project at the Johns Hopkins Hospital

Nurse-midwives at the Johns Hopkins Hospital, in conjunction with their colleagues in obstetrics, pediatrics, and infectious disease, are participating in a demonstration project designed to provide continuity of care for women with HIV disease in pregnancy. In the past 19 months, 73 women have been enrolled in the project. This article describes how the midwifery model of care has been integrated into the existing system of routine obstetric care and specialized HIV-related care at the institution. This project could serve as a model for others who are redesigning health care delivery systems to include more nurse-midwives, especially those who are trying to adapt to an ever-increasing number of women experiencing some phase of HIV disease during their pregnancy. A companion article explains the midwifery and medical protocols used in the project and discusses other clinically relevant issues.     

我国老年人认知衰弱转移规律及其影响因素研究

目的:了解我国老年人认知衰弱转移规律及其影响因素,为制定认知衰弱早期干预措施提供科学依据。方法:利用中国健康与养老追踪调查2011、2013和2015年3期数据,将个体健康状态划分为健壮-认知正常、认知障碍、躯体衰弱、认知衰弱4种,构建多状态Markov模型,探索认知衰弱转移规律及其影响因素。结果:共纳入3 470例老...     

Clinical application of energy dispersive x-ray microanalysis for nondestructively confirming dental metal allergens

Dental metal restorations contain and release allergens that cause metal allergy. Until now it has been a general treatment for dental metal allergy to remove all suspected metal restorations without confirming their chemical composition. This study describes the procedures to examine nondestructively the chemical composition of metal restorations by the use of an energy dispersive x-ray microanalysis system. The present results indicate that this new application of energy dispersive x-ray microanalysis could identify the dental metal restorations that contain elements positive in skin tests for the patient in whom a metal allergy is suspected and that the potential for the clinical use of energy dispersive x-ray microanalysis exists.     

横断面研究能否进行因果推断

基于变量调查(或测量)的共时性、统计学关联及幸存者偏倚等原因,横断面研究被认为不能进行因果推断,这是当前的"共识"。本文基于因果思维,借助因果图,首先明确定义真实截面和测量截面,并识别截面概念仅存在于理论的特性。实际横断面研究中,测量变量的共时性并不存在,而是无一例外地表现为非共时性时序,其实质上相当于测量变量间互为独立性假设,或不存在有差别错分偏倚。类似于累积病例对照研究和历史性队列研究,横断面研究均为暴露和结局已存在或发生后进行的测量,这种测量相当于对变量值的历史重建或"考古"。这类研究进行因果推断的共性前提条件之一是,测量变量与其历史变量间必须存在着因果律。测量变量均为真实变量的替代者,测量变量间的时序在因果推断上并不重要。应加强对横断面研究分析性角色的认识。