全文获取类型
收费全文 | 338543篇 |
免费 | 22030篇 |
国内免费 | 7508篇 |
专业分类
耳鼻咽喉 | 4063篇 |
儿科学 | 9524篇 |
妇产科学 | 6542篇 |
基础医学 | 27432篇 |
口腔科学 | 7935篇 |
临床医学 | 37040篇 |
内科学 | 42467篇 |
皮肤病学 | 4570篇 |
神经病学 | 19260篇 |
特种医学 | 7828篇 |
外国民族医学 | 31篇 |
外科学 | 36340篇 |
综合类 | 50452篇 |
现状与发展 | 12篇 |
一般理论 | 29篇 |
预防医学 | 34838篇 |
眼科学 | 5270篇 |
药学 | 30031篇 |
372篇 | |
中国医学 | 30581篇 |
肿瘤学 | 13464篇 |
出版年
2023年 | 5427篇 |
2022年 | 9640篇 |
2021年 | 13142篇 |
2020年 | 12279篇 |
2019年 | 18039篇 |
2018年 | 15763篇 |
2017年 | 12662篇 |
2016年 | 10176篇 |
2015年 | 9514篇 |
2014年 | 19595篇 |
2013年 | 21099篇 |
2012年 | 17996篇 |
2011年 | 19503篇 |
2010年 | 15665篇 |
2009年 | 14372篇 |
2008年 | 14004篇 |
2007年 | 14482篇 |
2006年 | 12625篇 |
2005年 | 10974篇 |
2004年 | 8938篇 |
2003年 | 7851篇 |
2002年 | 6162篇 |
2001年 | 5533篇 |
2000年 | 4577篇 |
1999年 | 3976篇 |
1998年 | 3221篇 |
1997年 | 3082篇 |
1996年 | 2671篇 |
1995年 | 2570篇 |
1994年 | 2476篇 |
1993年 | 1975篇 |
1992年 | 2006篇 |
1991年 | 1728篇 |
1990年 | 1539篇 |
1989年 | 1372篇 |
1988年 | 1301篇 |
1987年 | 1120篇 |
1985年 | 3786篇 |
1984年 | 4795篇 |
1983年 | 3339篇 |
1982年 | 3800篇 |
1981年 | 3545篇 |
1980年 | 3156篇 |
1979年 | 2904篇 |
1978年 | 2534篇 |
1977年 | 1906篇 |
1976年 | 2149篇 |
1975年 | 1631篇 |
1974年 | 1429篇 |
1973年 | 1277篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
47.
《Journal of the American Medical Directors Association》2020,21(4):531-537.e1
ObjectiveHospitalization-associated disability [HAD, ie, the loss of ability to perform ≥1 basic activities of daily living (ADLs) independently at discharge] is a frequent condition among older patients. The present study assessed whether a simple inpatient exercise program decreases HAD incidence in acutely hospitalized very old patients.DesignIn this randomized controlled trial (Activity in Geriatric Acute Care) participants were assigned to a control or intervention group and were assessed at baseline, admission, discharge, and 3 months thereafter.Setting and ParticipantsIn total, 268 patients (mean age 88 years, range 75–102) admitted to an acute care for older patients unit of a public hospital were randomized to a control (n = 125) or intervention (exercise) group (n = 143).MethodsBoth groups received usual care, and patients in the intervention group also performed simple supervised exercises (walking and rising from a chair, for a total duration of ∼20 minutes/day). We measured ADL function (Katz index) and incident HAD at discharge and after 3 months (primary outcome) and Short Physical Performance Battery, ambulatory capacity, number of falls, rehospitalization, and death during a 3-month follow-up (secondary outcomes).ResultsMedian duration of hospitalization was 7 days (interquartile range 4 days). The intervention group had a lower risk of HAD with reference to both baseline [odds ratio (OR) 0.36; 95% confidence interval (CI) 0.17–0.76, P = .007] and admission (OR 0.29; 95% CI 0.10–0.89, P = .030). A trend toward an improved ADL function at discharge vs admission was found in the intervention group compared with controls (OR 0.32; 95% CI ‒0.04 to 0.68; P = .083). No between-group differences were noted for the other endpoints (all P > .05).Conclusion and ImplicationsA simple inpatient exercise program decreases risk of HAD in acutely hospitalized, very old patients. 相似文献
48.
49.
50.