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   1078280篇
  免费   112668篇
  国内免费   2688篇
耳鼻咽喉   14509篇
儿科学   38831篇
妇产科学   29278篇
基础医学   160365篇
口腔科学   32646篇
临床医学   102207篇
内科学   216654篇
皮肤病学   29884篇
神经病学   91544篇
特种医学   40784篇
外国民族医学   311篇
外科学   163650篇
综合类   23890篇
一般理论   407篇
预防医学   82593篇
眼科学   24101篇
药学   77812篇
  3篇
中国医学   3078篇
肿瘤学   61089篇
  2021年   8559篇
  2020年   9376篇
  2019年   17904篇
  2018年   20114篇
  2017年   18753篇
  2016年   20516篇
  2015年   21540篇
  2014年   25495篇
  2013年   33786篇
  2012年   33518篇
  2011年   35396篇
  2010年   27071篇
  2009年   22753篇
  2008年   31228篇
  2007年   31837篇
  2006年   32347篇
  2005年   30691篇
  2004年   29968篇
  2003年   28692篇
  2002年   27802篇
  2001年   47829篇
  2000年   48913篇
  1999年   40675篇
  1998年   11274篇
  1997年   10168篇
  1996年   10228篇
  1995年   9823篇
  1994年   9133篇
  1992年   32284篇
  1991年   31494篇
  1990年   31029篇
  1989年   29902篇
  1988年   27193篇
  1987年   27346篇
  1986年   25444篇
  1985年   24625篇
  1984年   18470篇
  1983年   15567篇
  1982年   9327篇
  1979年   16896篇
  1978年   12257篇
  1977年   10340篇
  1976年   9783篇
  1975年   10212篇
  1974年   12331篇
  1973年   11856篇
  1972年   10892篇
  1971年   10121篇
  1970年   9379篇
  1969年   8734篇
排序方式: 共有10000条查询结果,搜索用时 0 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