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   169067篇
  免费   9042篇
  国内免费   231篇
耳鼻咽喉   2853篇
儿科学   5893篇
妇产科学   4288篇
基础医学   24677篇
口腔科学   5539篇
临床医学   14403篇
内科学   31781篇
皮肤病学   4569篇
神经病学   17182篇
特种医学   6947篇
外科学   25377篇
综合类   858篇
一般理论   47篇
预防医学   9857篇
眼科学   3717篇
药学   11560篇
中国医学   325篇
肿瘤学   8467篇
  2023年   1116篇
  2022年   835篇
  2021年   2170篇
  2020年   1735篇
  2019年   2176篇
  2018年   4154篇
  2017年   3426篇
  2016年   4288篇
  2015年   3773篇
  2014年   4508篇
  2013年   7319篇
  2012年   9341篇
  2011年   10248篇
  2010年   5853篇
  2009年   4153篇
  2008年   9680篇
  2007年   10191篇
  2006年   9804篇
  2005年   9761篇
  2004年   9107篇
  2003年   9162篇
  2002年   8940篇
  2001年   5868篇
  2000年   7235篇
  1999年   4177篇
  1998年   1687篇
  1997年   1348篇
  1996年   1082篇
  1995年   903篇
  1994年   888篇
  1993年   820篇
  1992年   983篇
  1991年   850篇
  1990年   777篇
  1989年   826篇
  1988年   675篇
  1987年   777篇
  1986年   653篇
  1985年   859篇
  1984年   754篇
  1983年   649篇
  1982年   656篇
  1981年   628篇
  1980年   580篇
  1979年   601篇
  1978年   524篇
  1977年   557篇
  1976年   460篇
  1975年   482篇
  1974年   476篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
23.
24.
25.
26.
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   

27.

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   
28.
29.
30.
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