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   138570篇
  免费   7174篇
  国内免费   137篇
耳鼻咽喉   2260篇
儿科学   4734篇
妇产科学   3235篇
基础医学   20813篇
口腔科学   4429篇
临床医学   11450篇
内科学   25123篇
皮肤病学   3964篇
神经病学   14106篇
特种医学   5927篇
外科学   21086篇
综合类   671篇
一般理论   39篇
预防医学   8118篇
眼科学   3035篇
药学   9612篇
中国医学   220篇
肿瘤学   7059篇
  2023年   795篇
  2022年   501篇
  2021年   1257篇
  2020年   1189篇
  2019年   1431篇
  2018年   2980篇
  2017年   2548篇
  2016年   3271篇
  2015年   2834篇
  2014年   3124篇
  2013年   5504篇
  2012年   7073篇
  2011年   7996篇
  2010年   4534篇
  2009年   3025篇
  2008年   8062篇
  2007年   8493篇
  2006年   8235篇
  2005年   8116篇
  2004年   7652篇
  2003年   7702篇
  2002年   7587篇
  2001年   5292篇
  2000年   6737篇
  1999年   3720篇
  1998年   1472篇
  1997年   1206篇
  1996年   955篇
  1995年   779篇
  1994年   769篇
  1993年   730篇
  1992年   745篇
  1991年   619篇
  1990年   607篇
  1989年   628篇
  1988年   528篇
  1987年   606篇
  1986年   504篇
  1985年   723篇
  1984年   686篇
  1983年   586篇
  1982年   615篇
  1981年   583篇
  1980年   532篇
  1979年   531篇
  1978年   484篇
  1977年   524篇
  1976年   441篇
  1975年   433篇
  1974年   429篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
13.
14.
15.
16.
17.
18.
19.
Objectives: The steeling effect suggests that early-life adversity can have a beneficial impact later in life. However, little is known about its underlying mechanisms and long-term outcomes . The study aimed to examine the role of early-life adversity (ELA) on successful aging, and whether this relationship can be explained by mental and physical health.

Method: Socio-demographics, early-life adversity (ELA), individual quality of life (iQoL), and mental and physical health of 270 individuals (Mage = 66.82 years, 71.5% female) were assessed. Polynomial regressions and mediation analyses were conducted.

Results: Significant inverse U-shaped associations were found between ELA and iQoL (β = ?.59, p = .005) and between ELA and mental health (β = ?.64, p = .002), but not between ELA and physical health. Furthermore, mental health significantly mediated the relationship between ELA and iQoL (b = ?.84, BCa CI [?1.66, ?.27]).

Conclusion: Highest level of individual quality of life (i.e. successful aging) was related to a moderate amount of ELA. Additionally, mental health significantly mediated this relationship. These findings suggest that some amount of ELA could be beneficial for successful aging. Resource-focused interventions are needed to improve health and promote successful aging for an underdetected, at-risk subgroup with low early-life adversity.  相似文献   

20.

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   
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