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   104308篇
  免费   30442篇
  国内免费   1091篇
耳鼻咽喉   2503篇
儿科学   2760篇
妇产科学   2519篇
基础医学   3599篇
口腔科学   5152篇
临床医学   26529篇
内科学   26315篇
皮肤病学   3461篇
神经病学   12894篇
特种医学   3807篇
外科学   18664篇
综合类   289篇
现状与发展   40篇
一般理论   33篇
预防医学   13921篇
眼科学   2304篇
药学   1774篇
中国医学   32篇
肿瘤学   9245篇
  2024年   743篇
  2023年   5047篇
  2022年   1176篇
  2021年   2842篇
  2020年   5351篇
  2019年   2051篇
  2018年   6961篇
  2017年   7388篇
  2016年   7995篇
  2015年   8096篇
  2014年   10527篇
  2013年   12297篇
  2012年   3991篇
  2011年   3762篇
  2010年   6911篇
  2009年   9256篇
  2008年   3738篇
  2007年   2733篇
  2006年   3863篇
  2005年   2432篇
  2004年   1853篇
  2003年   1482篇
  2002年   1422篇
  2001年   2046篇
  2000年   1344篇
  1999年   1859篇
  1998年   2144篇
  1997年   1965篇
  1996年   2011篇
  1995年   1736篇
  1994年   1147篇
  1993年   982篇
  1992年   911篇
  1991年   801篇
  1990年   651篇
  1989年   688篇
  1988年   660篇
  1987年   513篇
  1986年   494篇
  1985年   396篇
  1984年   366篇
  1983年   392篇
  1982年   312篇
  1981年   275篇
  1980年   184篇
  1978年   199篇
  1977年   183篇
  1976年   155篇
  1975年   154篇
  1974年   142篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.

Objective

The aim of the study was to estimate the effect of the state-based reinsurance programs through the section 1332 State Innovation Waivers on health insurance marketplace premiums and insurer participation.

Data Source

2015 to 2022 Robert Wood Johnson Foundation Health Insurance Exchange Compare Datasets.

Study Design

An event study difference-in-differences (DD) model separately for each year of implementation and a synthetic control method (SCM) are used to estimate year-by-year effects following program implementation.

Data Collection/Extraction Methods

Not applicable.

Principal Findings

Reinsurance programs were associated with a decline in premiums in the first year of implementation by 10%–13%, 5%–19%, and 11%–17% for bronze, silver, and gold plans (p < 0.05). There is a trend of sustained declines especially for states that implemented their programs in 2019 and 2020. The SCM analyses suggest some effect heterogeneity across states but also premium declines across most states. There is no evidence that reinsurance programs affected insurer participation.

Conclusion

State-based reinsurance programs have the potential to improve the affordability of health insurance coverage. However, reinsurance programs do not appear to have had an effect on insurer participation, highlighting the need for policy makers to consider complementary strategies to encourage insurer participation.  相似文献   
2.
3.
4.
5.
6.
7.
8.
9.
ABSTRACT

The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization.  相似文献   
10.
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