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   836篇
  免费   14篇
  国内免费   7篇
耳鼻咽喉   6篇
儿科学   74篇
妇产科学   24篇
基础医学   78篇
口腔科学   32篇
临床医学   46篇
内科学   174篇
皮肤病学   35篇
神经病学   40篇
特种医学   15篇
外科学   137篇
综合类   26篇
预防医学   26篇
眼科学   34篇
药学   53篇
中国医学   14篇
肿瘤学   43篇
  2024年   1篇
  2023年   2篇
  2022年   2篇
  2021年   34篇
  2020年   8篇
  2019年   140篇
  2018年   96篇
  2017年   58篇
  2016年   4篇
  2015年   4篇
  2014年   18篇
  2013年   15篇
  2012年   13篇
  2011年   11篇
  2010年   10篇
  2009年   9篇
  2008年   10篇
  2007年   12篇
  2006年   13篇
  2005年   5篇
  2004年   7篇
  2003年   5篇
  2002年   9篇
  2001年   11篇
  2000年   6篇
  1999年   4篇
  1998年   1篇
  1997年   4篇
  1995年   1篇
  1994年   4篇
  1993年   1篇
  1992年   1篇
  1989年   1篇
  1988年   1篇
  1985年   41篇
  1984年   62篇
  1983年   37篇
  1982年   50篇
  1981年   51篇
  1980年   27篇
  1979年   27篇
  1978年   16篇
  1977年   16篇
  1976年   9篇
排序方式: 共有857条查询结果,搜索用时 15 毫秒
31.

Background and aims

High sodium (Na) and low potassium (K) intake are associated with hypertension and CVD risk. This study explored the associations of health literacy (HL), food literacy (FL), and salt awareness with salt intake, K intake, and Na/K ratio in a workplace intervention trial in Switzerland.

Methods and results

The study acquired baseline data from 141 individuals, mean age 44.6 years. Na and K intake were estimated from a single 24-h urine collection. We applied validated instruments to assess HL and FL, and salt awareness. Multiple linear regression was used to investigate the association of explanatory variables with salt intake, K intake, and Na/K. Mean daily salt intake was 8.9 g, K 3.1 g, and Na/K 1.18. Salt intake was associated with sex (p < 0.001), and K intake with sex (p < 0.001), age (p = 0.02), and waist-to-height ratio (p = 0.03), as was Na/K. HL index and FL score were not significantly associated with salt or K intake but the awareness variable “salt content impacts food/menu choice” was associated with salt intake (p = 0.005).

Conclusion

To achieve the established targets for population Na and K intake, health-related knowledge, abilities, and skills related to Na/salt and K intake need to be promoted through combined educational and structural interventions.Clinical Trials Registry number: DRKS00006790 (23/09/2014).  相似文献   
32.
Records of all 34 patients with positive blood cultures for enterococcus at Mount Sinai Medical Center of Greater Miami in 1981 were reviewed. Twenty-four true bacteremias were identified from sources including the pelvis/abdomen (9), urinary tract (6), wounds (2), IV catheter (2), contaminated needle (1), endocarditis (1), and primary bacteremia (3). Sixteen of the 24 true bacteremias were hospital acquired, and these infectious accounted for 7 of 9 (78%) fatal outcomes. Fourteen of 16 patients with hospital-acquired infection received prior antibiotic therapy. Eight (24%) of the original 34 patients had positive blood cultures for enterococcus as a result of cross-contamination from an automated blood culture analyzer. The rate of cross-contamination per positive blood culture for enterococcus in 1981 was 22%. Two remaining patients in the original series could not be placed in a category of true infection of cross-contamination. Although there was a real increase in the number of enterococcal bacteremias in 1981, a much larger apparent increase was explained by several episodes of pseudobacteremia.  相似文献   
33.

Objective

To examine whether a Rasch analysis is sufficient to establish the construct validity of the Motor Function Measure (MFM) and discuss whether weighting the MFM item scores would improve the MFM construct validity.

Design

Observational cross-sectional multicenter study.

Setting

Twenty-three physical medicine departments, neurology departments, or reference centers for neuromuscular diseases.

Participants

Patients (N=911) aged 6 to 60 years with Charcot-Marie-Tooth disease (CMT), facioscapulohumeral dystrophy (FSHD), or myotonic dystrophy type 1 (DM1).

Interventions

None.

Main Outcome Measure(s)

Comparison of the goodness-of-fit of the confirmatory factor analysis (CFA) model vs that of a modified multidimensional Rasch model on MFM item scores in each considered disease.

Results

The CFA model showed good fit to the data and significantly better goodness of fit than the modified multidimensional Rasch model regardless of the disease (P<.001). Statistically significant differences in item standardized factor loadings were found between DM1, CMT, and FSHD in only 6 of 32 items (items 6, 27, 2, 7, 9 and 17).

Conclusions

For multidimensional scales designed to measure patient abilities in various diseases, a Rasch analysis might not be the most convenient, whereas a CFA is able to establish the scale construct validity and provide weights to adapt the item scores to a specific disease.  相似文献   
34.
35.
36.
37.
38.
39.
40.
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