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   736篇
  免费   34篇
  国内免费   18篇
耳鼻咽喉   5篇
儿科学   18篇
妇产科学   25篇
基础医学   54篇
口腔科学   5篇
临床医学   53篇
内科学   195篇
皮肤病学   5篇
神经病学   119篇
特种医学   7篇
外科学   110篇
综合类   23篇
预防医学   65篇
眼科学   1篇
药学   51篇
中国医学   3篇
肿瘤学   49篇
  2023年   14篇
  2022年   29篇
  2021年   39篇
  2020年   43篇
  2019年   42篇
  2018年   46篇
  2017年   25篇
  2016年   35篇
  2015年   31篇
  2014年   81篇
  2013年   64篇
  2012年   33篇
  2011年   66篇
  2010年   31篇
  2009年   31篇
  2008年   51篇
  2007年   31篇
  2006年   23篇
  2005年   11篇
  2004年   12篇
  2003年   6篇
  2002年   9篇
  2001年   7篇
  1999年   6篇
  1998年   3篇
  1997年   2篇
  1996年   1篇
  1995年   2篇
  1994年   2篇
  1993年   1篇
  1992年   4篇
  1991年   1篇
  1989年   3篇
  1982年   2篇
  1979年   1篇
排序方式: 共有788条查询结果,搜索用时 31 毫秒
1.
Nursing schools strive to select a diverse student population who are likely to succeed by ensuring timely student progression through the program and effective use of educational sources. The purpose of this systematic literature review is to explore the preadmission variables and selection criteria that predict student success in 4-year baccalaureate nursing programs in the U.S. Sixteen articles met the eligibility criteria, and six measures were used to define student success: (a) early academic success, particularly during the first and second year; (b) attrition; (c) timely completion of the program; (d) graduation; (e) performance in nursing courses; and (f) academic performance in other science courses. Typically, the core set of cognitive predictors used in the admission process in nursing schools were pre-nursing GPA, pre-nursing collegiate science GPA, and scores on standardized aptitude exams. This review suggests that it is challenging to isolate one single variable as the best predictor of student success; however, using a combination of variables can offer a reliable prediction method. More researchers should consider using a theoretical basis to guide their inquiry on this topic. Additionally, researchers should examine admission variables that are most relevant across programs.  相似文献   
2.
Hip fracture results in excess mortality and functional disability. This study sought to identify predictors of mortality and limited functional ability 1 year after hip fracture. We conducted a 1-year follow-up of a prospective population-based inception cohort of 218 hip fracture patients who had been consecutively admitted and discharged from hospital during the previous year. Mortality was observed to be independently associated with poor mental status (relative risk [RR]=6.96; 95% confidence interval [95% CI], 1.73–28.00), prefracture limited functional ability (RR=4.35; 95% CI, 1.32–14.36), institutionalized disposition at discharge (RR=2.92; 95% CI, 1.02–8.38), and male gender (RR=2.44; 95% CI, 1.01–5.93). Independent predictors of limited functional ability were prefracture functional disability (RR=34.14; 95% CI, 3.13–372.33), poor mental status (RR=9.71; 95% CI, 1.57–59.82), age >80 years (RR=4.03; 95% CI, 1.48–11.00), and female gender (RR=3.57; 95% CI, 0.08–0.98). On discharge, special attention and care should thus be given to all patients displaying any of the above predictive factors.  相似文献   
3.
This study examined predictors of employment among substance-using men and women enrolled in welfare-to-work programs. Participants were 394 welfare applicants assigned to either coordinated care management or usual care for treatment services and job training and followed up for 1 year to track employment outcomes. Common barriers to work were assessed at baseline in four key domains: disabilities, situational barriers, labor capital, and motivation. Results indicated substantial gender differences in the number and profile of work barriers. Among men, work experience and job motivation were the only significant predictors of employment; among women, multiple factors from each barrier domain predicted job acquisition even when controlling for all other significant predictors. Findings suggest that welfare-to-work programs should emphasize job training and job seeking during the early stages of welfare interventions for men and for many women.  相似文献   
4.
大学生寻求专业性心理帮助态度的预测因素研究   总被引:2,自引:0,他引:2  
目的:探讨大学生寻求专业性心理帮助态度的预测因素。方法:选取700名不同年级、不同专业的大学生作样本,进行问卷调查。结果:以寻求专业性心理帮助态度为因变量,进行性别(2)×专业(2)的方差分析。结果发现,性别的主效应显著,F(1,615)=3.294,P=0.050。专业的主效应显著,F(1,615)=20.896,P=0.001。性别和专业的交互效应没达到显著性水平,F(1,615)=1.890,P=0.170。以寻求专业性心理帮助态度为因变量,回归分析结果得出R=0.636,R2=0.405,F=29.641,P=0.001,说明建立的回归方程是有意义的。结论:①对寻求专业性心理帮助态度有显著预测作用的变量按预测作用大小排序依次是:是否求助过、依赖的自我结构、自我隐藏度、专业、内控性和性别。②女生的寻求专业性心理帮助的态度比男生积极。③文体艺术类学生的寻求专业性心理帮助的态度比非文体艺术类学生积极。④自我结构是相互依赖的人寻求专业性心理帮助的态度积极。⑤自我隐藏度高的人寻求专业性心理帮助的态度消极。⑥内控者寻求专业性心理帮助的态度消极。  相似文献   
5.
The relationship between blood pressure in the laboratory (both at rest and in response to laboratory tasks) and ambulatory blood pressure at home and at work was evaluated. One hundred nineteen normotensive and unmedicated mild-moderate hypertensive black and white females and males participated in laboratory blood pressure monitoring at rest and during four challenging tasks (structured interview, video game, bicycle exercise, and cold pressor test) as well as ambulatory blood pressure monitoring while at home and at work. Baseline blood pressure taken while subjects were at rest was the strongest predictor of ambulatory systolic blood pressure (r = .64) and diastolic blood pressure (r = .77) at work. Among reactivity tasks the strongest predictors of ambulatory blood pressure in the total population were the structured interview and the video game (both psychological tasks) followed by the cold pressor test. Racial comparisons, however, determined that the cold pressor test predicted diastolic blood pressure significantly better for blacks (r = .73) than for whites (r = .40), suggesting a possible difference in blood pressure regulation.  相似文献   
6.

Background

The primary aim was to assess survival of opening wedge high tibial osteotomy (HTO) for medial compartment osteoarthritis. The secondary aim was to identify independent predictors of early conversion to total knee arthroplasty (TKA).

Methods

During the 18-year period (1994–2011) 111 opening wedge HTO were performed at the study centre. Mean age was 45 years (range 18–68) and the majority male (84%). Mean follow-up was 12 (range six to 21) years. Failure was defined as conversion to TKA. Kaplan–Meier, Cox regression and receiver operating curve (ROC) analyses were performed.

Results

Forty (36.0%) HTO failed at a mean of 6.3 years (range one to 15). By Kaplan–Meier analysis, the five-year survival rate was 84% (95% confidence interval (CI) 82.6–85.4), 10-year rate 65% (95% CI 63.5–66.5) and 15-year rate 55% (95% CI 53.3–56.7). Cox regression analysis identified older age (hazard ratio (HR) 1.07 for each additional year, 95% CI 1.03–1.11, p b 0.001) and female gender (HR 2.37, 95% CI 1.06–5.33, p?=?0.04) as independent predictors of failure. ROC analysis identified a threshold age of 47 years above which the risk of failure increased significantly (area under curve 0.72, 95% CI 0.62–0.81, p b 0.001). Cox regression analysis, adjusting for covariates, identified a significantly greater (HR 2.49, 95% CI 1.26–4.91, p?=?0.01) risk of failure in patients aged 47 years old or more.

Conclusion

The risk of early conversion to TKA is significantly increased in females and those older than 47. These risk factors should be considered pre-operatively when planning intervention for isolated medial compartment osteoarthritis.  相似文献   
7.
目的探讨肝门部胆管癌术后医院感染的预测因素。方法回顾性分析2013年1月至2019年12月于福建医科大学附属第一医院手术治疗的243例肝门部胆管癌病人的临床资料,根据术后是否出现感染分为感染组和非感染组,对比两组病人的一般临床资料、治疗、手术及术后并发症等情况。观察术后感染病人病原学特点,采用单因素分析及多因素Logistic分析探究肝门部胆管癌术后发生医院感染的预测因素。结果243例肝门部胆管癌病人中术后发生医院感染45例,感染率18.52%,术后感染病人临床送检标本共培养病原菌62株,其中革兰阴性菌45株(72.58%),以大肠埃希菌为主,革兰阳性菌13株(20.97%),真菌4株(6.45%)。肝门部胆管癌病人术后发生医院感染的预测因素为:术前合并糖尿病、肝内胆管结石、黄疸、胆道感染,手术合并肝切除、手术时间长、术中出血量大、术中输血、中心静脉置管时间长、留置导尿管时间长,术后胆漏。多因素Logistic回归分析显示:术前胆红素高、糖尿病、术中出血量多、术中输血、术后出现胆漏是术后医院感染的独立预测因素。结论肝门部胆管病人术前胆红素高、糖尿病、术中出血量多、术中输血、术后出现胆漏可作为肝门部胆管癌术后医院感染的独立预测因素。  相似文献   
8.
9.
《Clinical microbiology and infection》2021,27(7):1038.e1-1038.e6
ObjectivesThe aim of this study was to evaluate acquired drug resistance in Italy in the 2009–2018 period.MethodsWe analysed 3094 patients from the Italian ARCA database who had failed antiretroviral treatment and who had received a genotypic test after 6 months of treatment. Drug resistance mutations were identified using International AIDS Society (IAS)-USA tables and the Stanford HIVdb algorithm. The global burden of acquired resistance was calculated among all subjects with antiretroviral failure. Time trends and correlates of resistance were analysed using standard statistical tests.ResultsPatients of non-European origin and non-B subtypes increased significantly from 11.5% (103/896) to 19.2% (33/172) and from 13.1% (141/1079) to 23.8% (53/223), respectively, over time. Overall, 14.5% (448/3094), 12.1% (374/3094) and 37.8% (1169/3094) of patients failed first, second and later lines, respectively. According to both IAS and HIVdb, in the study period resistance to any class, nucleoside reverse inhibitor, non-nucleoside reverse inhibitor, and protease inhibitors (PIs) declined significantly. Integrase strand transfer inhibitor (INSTI) resistance declined significantly from 31% (36/116) to 20.8% (41/197) according to HIVdb but not to IAS. Divergent data were highlighted regarding the proportion of non-European patients carrying any, PI and INSTI resistance using IAS tables compared with the Stanford HIVdb algorithm, as the former failed to detect a decrease in resistance while the latter indicates a reduction of 1.6-, 5- and 1.8-fold resistance for such drug classes. In the multivariate analysis, the risk of resistance increased in patients with a larger number of treatment lines and higher viraemia and decreased in those starting therapy in the last biennium of the study.DiscussionA marked reduction in drug resistance was observed over 10 years, compatible with higher genetic barrier and potency of new antiretrovirals. Nonetheless, concerns remain for subjects with non-B subtypes when using mutation lists instead of interpretation systems because of the extensive polymorphism of the protease region.  相似文献   
10.
While assessing immunization programmes, not only vaccination coverage is important, but also timely receipt of vaccines. We estimated both vaccination coverage and timeliness, as well as reasons for non-vaccination, and identified predictors of delayed or missed vaccination, for vaccines of the first two years of age, in El Salvador.  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