全文获取类型
| 收费全文 | 4588981篇 |
| 免费 | 324778篇 |
| 国内免费 | 9978篇 |
专业分类
| 耳鼻咽喉 | 64911篇 |
| 儿科学 | 151704篇 |
| 妇产科学 | 126580篇 |
| 基础医学 | 651228篇 |
| 口腔科学 | 129969篇 |
| 临床医学 | 423431篇 |
| 内科学 | 877622篇 |
| 皮肤病学 | 104616篇 |
| 神经病学 | 371170篇 |
| 特种医学 | 173792篇 |
| 外国民族医学 | 1654篇 |
| 外科学 | 685707篇 |
| 综合类 | 98966篇 |
| 现状与发展 | 15篇 |
| 一般理论 | 1860篇 |
| 预防医学 | 363916篇 |
| 眼科学 | 108478篇 |
| 药学 | 339116篇 |
| 17篇 | |
| 中国医学 | 8991篇 |
| 肿瘤学 | 239994篇 |
出版年
| 2019年 | 36498篇 |
| 2018年 | 50380篇 |
| 2017年 | 38242篇 |
| 2016年 | 43750篇 |
| 2015年 | 49279篇 |
| 2014年 | 69057篇 |
| 2013年 | 104827篇 |
| 2012年 | 141591篇 |
| 2011年 | 150713篇 |
| 2010年 | 90721篇 |
| 2009年 | 85915篇 |
| 2008年 | 140869篇 |
| 2007年 | 149963篇 |
| 2006年 | 151744篇 |
| 2005年 | 146659篇 |
| 2004年 | 141285篇 |
| 2003年 | 136176篇 |
| 2002年 | 131963篇 |
| 2001年 | 204455篇 |
| 2000年 | 210180篇 |
| 1999年 | 178477篇 |
| 1998年 | 53797篇 |
| 1997年 | 47135篇 |
| 1996年 | 47081篇 |
| 1995年 | 45123篇 |
| 1994年 | 41722篇 |
| 1993年 | 39173篇 |
| 1992年 | 141030篇 |
| 1991年 | 137330篇 |
| 1990年 | 133710篇 |
| 1989年 | 129517篇 |
| 1988年 | 119531篇 |
| 1987年 | 117465篇 |
| 1986年 | 110605篇 |
| 1985年 | 106273篇 |
| 1984年 | 79861篇 |
| 1983年 | 68168篇 |
| 1982年 | 40545篇 |
| 1981年 | 36687篇 |
| 1979年 | 73270篇 |
| 1978年 | 51970篇 |
| 1977年 | 44251篇 |
| 1976年 | 41513篇 |
| 1975年 | 44543篇 |
| 1974年 | 53029篇 |
| 1973年 | 50769篇 |
| 1972年 | 47816篇 |
| 1971年 | 44673篇 |
| 1970年 | 41606篇 |
| 1969年 | 39549篇 |
排序方式： 共有10000条查询结果，搜索用时 4 毫秒
31.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
32.
33.
34.
35.
36.
37.
38.
39.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618
Background
Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).Methods
All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.Results
Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.Conclusion
Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system. 相似文献40.