首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2078736篇
  免费   156514篇
  国内免费   4152篇
耳鼻咽喉   29213篇
儿科学   72032篇
妇产科学   58377篇
基础医学   298060篇
口腔科学   57167篇
临床医学   185862篇
内科学   407286篇
皮肤病学   46388篇
神经病学   164056篇
特种医学   81540篇
外国民族医学   942篇
外科学   315044篇
综合类   47169篇
现状与发展   1篇
一般理论   744篇
预防医学   160607篇
眼科学   47062篇
药学   152343篇
  5篇
中国医学   4013篇
肿瘤学   111491篇
  2018年   21522篇
  2017年   16507篇
  2016年   18414篇
  2015年   20879篇
  2014年   28886篇
  2013年   44243篇
  2012年   59496篇
  2011年   63274篇
  2010年   37939篇
  2009年   35925篇
  2008年   60134篇
  2007年   64172篇
  2006年   64759篇
  2005年   62674篇
  2004年   61190篇
  2003年   59070篇
  2002年   57640篇
  2001年   98650篇
  2000年   101715篇
  1999年   86166篇
  1998年   24048篇
  1997年   21651篇
  1996年   21953篇
  1995年   21014篇
  1994年   19754篇
  1993年   18325篇
  1992年   68654篇
  1991年   67267篇
  1990年   65593篇
  1989年   62936篇
  1988年   57731篇
  1987年   57320篇
  1986年   53571篇
  1985年   51570篇
  1984年   38722篇
  1983年   32672篇
  1982年   19286篇
  1981年   17459篇
  1979年   35094篇
  1978年   24927篇
  1977年   21096篇
  1976年   19829篇
  1975年   21193篇
  1974年   25115篇
  1973年   24253篇
  1972年   22288篇
  1971年   20536篇
  1970年   19199篇
  1969年   17607篇
  1968年   16245篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  相似文献   
10.
Abstract

The study examines Parental Feeding Practices (PFP) in relation to adherence to the Mediterranean Diet (MD) and children’s weight status. It’s a cross-sectional study of 402 parents (68.4% mothers), with children aged 2–12 years. Parents completed the Comprehensive Parental Feeding Questionnaire and the Mediterranean Diet Quality Index for children and adolescents (KIDMED), evaluating children’s adherence to the MD. Logistic regression showed that in children aged 2–<6 years, “emotion regulation/food as reward” and “pressure” decrease MD adherence (OR?=?0.186, p?<?0.0001 and OR?=?0.496, p?=?0.004), and “monitoring” decrease excess body weight (OR?=?0.284, p?=?0.009). In older children (6–12 years), “healthy eating guidance” and “monitoring” increase MD adherence (OR?=?3.262, p?=?0.001 and OR?=?3.147, p?<?0.0001), “child control” decreases MD adherence (OR?=?0.587, p?=?0.049), “pressure” decrease excess body weight (OR?=?0.495, p?<?0.0001) and “restriction” increase excess body weight (OR?=?1.784, p?=?0.015). “Healthy eating guidance” and “monitoring” seem to be the best PFP employed, in terms of children’s MD adherence and weight status.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号