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   1827篇
  免费   108篇
  国内免费   7篇
耳鼻咽喉   5篇
儿科学   23篇
妇产科学   22篇
基础医学   54篇
口腔科学   19篇
临床医学   199篇
内科学   148篇
皮肤病学   9篇
神经病学   36篇
特种医学   14篇
外科学   100篇
综合类   142篇
预防医学   927篇
眼科学   4篇
药学   198篇
  1篇
中国医学   14篇
肿瘤学   27篇
  2024年   11篇
  2023年   54篇
  2022年   98篇
  2021年   94篇
  2020年   111篇
  2019年   172篇
  2018年   139篇
  2017年   100篇
  2016年   62篇
  2015年   73篇
  2014年   119篇
  2013年   128篇
  2012年   104篇
  2011年   97篇
  2010年   77篇
  2009年   105篇
  2008年   65篇
  2007年   61篇
  2006年   41篇
  2005年   43篇
  2004年   20篇
  2003年   24篇
  2002年   20篇
  2001年   21篇
  2000年   22篇
  1999年   15篇
  1998年   12篇
  1997年   7篇
  1996年   6篇
  1995年   6篇
  1994年   3篇
  1993年   2篇
  1992年   1篇
  1991年   4篇
  1990年   3篇
  1989年   1篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   6篇
  1984年   3篇
  1983年   1篇
  1981年   2篇
  1980年   1篇
  1979年   1篇
  1977年   1篇
  1969年   1篇
排序方式: 共有1942条查询结果,搜索用时 15 毫秒
61.
62.
The Family Smoking Prevention and Tobacco Control Act (FSPTCA) give the U.S. Food and Drug Administration (FDA) unprecedented power to regulate tobacco products. One of the most significant provisions of the law allows state and local governments to adopt and enforce tobacco control legislation restricting the time, place, and manner (but not the content) of tobacco advertising. However, there is still reluctance among states and localities for mass adoption of laws due to challenges associated with legal feasibility and lack of U.S.-based evidence in effectiveness. The Center for Public Health Systems Science conducted interviews with key tobacco control contacts in 48 states at two time points (2012 and 2014) since the passage of the FSPTCA to assess the influence of the law on point-of-sale policy development in their state tobacco programs. Logistic regression results show that point-of-sale policy importance is growing post-FSPTCA, and that key influencers of this importance are states'' tobacco control histories and environments, including that related to excise taxes and smoke free air policies. The adoption of smokefree and tax policies has become commonplace across the U.S., and the quality and extent of these laws and prevailing political will increasingly impact the ability of states to work in emerging tobacco control policy areas including those directed at the point of sale.  相似文献   
63.

Objectives

Since the Cabinet’s decision concerning the Basic Policies 2005, the Japanese government has implemented specific measures to suppress increases in national medical care expenditure. However, we believe that the economic significance of medical care should be quantified in terms of its economic impact on national medical care expenditure. No one has examined the economic impact of all medical institutions in Japan using data from a statement of profits and losses. We used an input–output analysis to quantitatively estimate economic impact of medical care and examined its estimation range with a probabilistic sensitivity analysis.

Methods

To estimate the economic impact and economic impact multipliers of all medical institutions in Japan, an input–output analysis model was developed using an input–output table, statement of profits and losses, margin rates, employee income rates, consumption propensity and an equilibrium output model. Probabilistic sensitivity analysis was conducted using a Monte Carlo simulation.

Results

Economic impact of medical care in all medical institutions was ¥72,107.4 billion ($661.5 billion). This impact yielded a 2.78-fold return of medical care expenditure with a 95 % confidence interval ranging from 2.74 to 2.90.

Conclusion

Economic impact of medical care in Japan was two to three times the medical care expenditure (per unit). Production inducement of medical care is comparable to other industrial sectors that are highly influential toward the economy. The contribution to medical care should be evaluated more explicitly in national medical care expenditure policies.  相似文献   
64.

Background

China has made remarkable efforts and achievements since its health reform in 2009, yet there are substantial knowledge gaps in the quality of primary health care (PHC) in China. We aimed to assess the quality of PHC in China by analysing hospital admission rates among diabetics, a frequently used quality indicator for PHC.

Methods

We obtained data from a nationwide longitudinal survey for 1006, 1472, and 1771 participants with diabetes who were surveyed as part of China Health and Retirement Longitudinal Study in 2011, 2013, and 2015, respectively. We described and analysed primary care coverage and hospital admission rates (proportion of patients with diabetes who were admitted to hospital) to assess the quality of PHC in eastern, central, and western China. Primary care coverage included proportion of patients who received diabetes-related health education, examinations, and treatments. We used logistic regressions to model the changes of primary care coverage and hospital admission rates in 2011–15 by adjusting for sociodemographic variables. Ethical approval is not applicable in this study as we use anonymised secondary data.

Findings

Health education coverage decreased significantly in 2011–15 (76·17% in 2011, 73·15% in 2013, and 70·15% in 2015; OR 0·747 [95% CI 0·62–0·90]) whereas the proportion of patients who received diabetic-related examinations and medical treatments remained largely unchanged (78·88% in 2011, 78·35% in 2013, and 81·45% in 2015; OR 1·18 [95% CI 0·95–1·45]). Moreover, the proportion of patients who received diabetic-related examinations in the west was lower than that in the east (OR 0·52 [0·35–0·76]). Diabetes-related hospital admission rates increased from 4·01% in 2011 to 6·08% in 2013 (OR 1·47 [0·97–2·22]), and recurrent hospital admission rates increased from 18·87% in 2011 to 28·45% in 2015 (OR 1·78 [1·44–2·20]). Both diabetes-related admission rates (OR 1·80 [1·13–2·87]) and recurrent hospital admission rates (OR 1·92 [1·50–2·45]) were higher in the west than in the east.

Interpretation

Judging by the patient-reported process and outcome indicators studied, quality of PHC has not improved in China between 2011–2015. Continuous evidence-based monitoring, evaluation and reporting of PHC quality are crucial for accomplishing the goals of health-care system reform in China.

Funding

China Medical Board (grant number CMB-OC-16-259).  相似文献   
65.

Background

People with prehypertension are highly likely to develop hypertension and other cardiovascular diseases. Lifestyle modifications may prevent hypertension in patients with prehypertension, but evidence remains scarce in developing countries. This study aimed to investigate whether a community-based intervention could prevent hypertension through lifestyle modifications in people with prehypertension in the rural areas of China.

Methods

A community-based quasi-experiment design was applied. Eighteen villages from six townships in Sheyang county, a rural area in eastern China, were randomly sampled. Of these local residents, patients with prehypertension—a systolic blood pressure (SBP) of 120–139 mm Hg or a diastolic blood pressure (DBP) of 80–89 mm Hg—and who were 30–60 years old were screened. Participants from three of the townships (n=206) were randomly assigned to the intervention group, and those from the other three townships (n=250) were assigned to the control group. At the outset, intervention group participants received individual consultations from a community health management team to assess their self-management ability, determine their lifestyle, set goals for a healthier lifestyle, and design individualised action plans. A guideline booklet was provided to intervention group participants, which contained detailed explanations of hypertension, prehypertension, healthy lifestyles and their impacts, and methods to lose weight, cease smoking, and deal with mental pressure. Intervention group participants also received quarterly follow-ups to assess the implementation of action plans, identify difficulties in changing unhealthy lifestyles, and find feasible solutions. In both intervention and control groups, usual care was provided to participants according to national guidelines, and the available resources were the same across the townships. Evaluations were conducted at baseline, and at the end of months 6, 12, 18, and 30. Between-group analyses were performed using repeated measures ANOVA. Written informed consent was obtained from the participants.

Findings

At 30 months, 18 participants in the intervention group (n=188) showed progression to hypertension, whereas 47 in the control group (n=234) developed hypertension. This difference between intervention and control groups was statistically significant (9·6 vs 20·1%, p=0·007). Significant changes in DBP (–2·7 vs 0·7 mmHg, p<0·0001), weight (–0·79 vs ?0·66 kg, p=0·029), and daily walking steps (11?500 vs 8000 steps, p<0·0001) were observed between intervention and control groups. No differential effects were found for SBP, drinking, and smoking, with both groups showing substantial improvements.

Interpretation

This intervention could prevent hypertension among patients with prehypertension by improving health-related behaviours. This study might be one of the first community-based experiments implemented among people with prehypertension in the rural areas of China. Further investigations are required to assess the sustainability of this intervention.

Funding

This study was funded by the Postgraduates Innovation Project of Jiangsu Province (KYZZ15_0267).  相似文献   
66.
秦皇岛港务集团艾滋病健康教育政策评估   总被引:2,自引:0,他引:2  
目的开展艾滋病健康教育的政策设计和实施评估,探索工作场所艾滋病健康教育政策的研究方法。方法参照国内外关于工作场所艾滋病健康教育的5项主要政策要求,对秦皇岛港务局现有政策及其执行情况进行政策关键点定性评价。同时,对秦皇岛港务集团职工进行随机抽样,共抽得2046人,用问卷进行有关态度、知识和行为等定量调查。结果①参照政策的30个政策点有21个被列入了《2002-2005年秦皇岛港务集团遏制与防治艾滋病实施方案》,占70%;列入方案的政策点已全部实施;从实施效果看,较好、一般和较差的分别占已实施政策点的24%、66%和10%。②职工们对组织宣传、教育活动、允许艾滋病感染者和病人继续工作,进行艾滋病个人咨询等方面态度积极。③领导干部和其他职工的艾滋病基本知识得分分别为85.9和82.7。结论秦皇岛港务集团的艾滋病健康教育政策实施效果良好,但仍需要继续完善政策设计;该企业职工大部分积极支持艾滋病健康教育政策,可是在态度、知识和技能方面的政策需求差异性仍需探讨;职工们还存在一些对艾滋病基本知识误解的情况,需要在健康教育中重点加强。  相似文献   
67.
BackgroundThis study presents a framework for determining the allocation and distribution of the limited amount of vaccines against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).MethodsAfter analyzing the pandemic strategies of the major organizations and countries and with a literature review conducted by a core panel, a modified Delphi survey was administered to 13 experts in the fields of vaccination, infectious disease, and public health in the Republic of Korea. The following topics were discussed: 1) identifying the objectives of the vaccination strategy, 2) identifying allocation criteria, and 3) establishing a step-by-step vaccination framework and prioritization strategy based on the allocation criteria. Two rounds of surveys were conducted for each topic, with a structured questionnaire provided via e-mail in the first round. After analyzing the responses, a meeting with the experts was held to obtain consensus on how to prioritize the population groups.ResultsThe first objective of the vaccination strategy was maintenance of the integrity of the healthcare system and critical infrastructure, followed by reduction of morbidity and mortality and reduction of community transmission. In the initial phase, older adult residents in care homes, high-risk health and social care workers, and personal support workers who work in direct contact with coronavirus disease 2019 (COVID-19) patients would be prioritized. Expansion of vaccine supply would allow immunization of older adults not included in phase 1, followed by healthcare workers not previously included and individuals with comorbidities. Further widespread vaccine supply would ensure availability to the extended adult age groups (50–64 years old), critical workers outside the health sector, residents who cannot socially distance, and, eventually, the remaining populations.ConclusionThis survey provides the much needed insight into the decision-making process for vaccine allocation at the national level. However, flexibility in adapting to strategies will be essential, as new information is constantly emerging.  相似文献   
68.
ObjectiveTo investigate clinical stem cell research doctors to know their profe ssional training situation, cognition of related policy and satisfaction. MethodsSix grade A hospitals including 23 departments and 128 doctors were investigated by using self made questionnaire. ResultsOf 128 doctors, 53.1% did not participate in the stem cell technology professional training while 27.3% of them were familiar with stem cell management policies and regulations. Age, title, education, hospital, department, years of working in clinical stem cell research, whether participation in training, whether trained in the organization by their hospitals were the influence factors. 32.0% of doctors were satisfied with the current stem cell policy. ConclusionHospitals should encourage doctors to participate in stem cell professional training to increase their professional technology. Hospitals need to organize stem cell policy lectures, propagate the national stem cell policy, standardize physician’s behavior of stem cell clinical trials, and consider doctors’ advice and feedback as reference for relevant policy.  相似文献   
69.

Background

Catastrophic health expenditure (CHE) is measured to assess the financial protection from the risk of health-related conditions, which is considered a principle performance goal of any health system. The incidence and intensity of CHE in the occupied Palestinian territory between 1998 and 2007 was assessed in previous research; however, no research has assessed the occurrence of CHE in different population groups in the occupied Palestinian territory. The objective of this study was to examine the changes in the occurrence of CHE in different groups of Palestinians from 1996 to 2011, which was a period of increasing political turmoil, transformation of the national health system, and economic hardship faced by the population.

Methods

The repeated cross-sectional series of the Palestinian Expenditure and Consumption Survey was conducted by the Palestinian Central Bureau of Statistics ten times between 1996 and 2011. Each survey asks detailed questions about a household's expenditure, including spending on health, using a diary approach. CHE was measured using a threshold of spending of 10% or more of the household's resources on health care. Total household expenditure was used as a proxy of a household's resources. The occurrence of CHE was traced from 1996 to 2011 and compared across different expenditure quantiles, dwellers of urban areas, rural areas, or refugee camps, and the characteristics of head of households within the West Bank and the Gaza Strip were compared.

Findings

CHE in the occupied Palestinian territory increased from 7·3% of households in 1996 to 8·2% of households in 2011. This increase was observed in the West Bank and Gaza Strip. However, the occurrence of CHE in the Gaza Strip was consistently and significantly lower than in the West Bank. CHE was consistently higher in the worse-off expenditure quantiles in the occupied Palestinian territory and in the West Bank compared with affluent households. The change in the occurrence of CHE in different expenditure quantiles in the Gaza Strip was statistically insignificant from 1997 to 2004. From 2005 onward, the economically vulnerable groups of the households have become less exposed to CHE than affluent households. The occurrence of CHE in households in rural areas of the West Bank was consistently higher than elsewhere. Households in the West Bank with illiterate heads of family were consistently more exposed to CHE than other households, whereas the opposite was observed in the Gaza Strip.

Interpretation

The findings should be interpreted within the context of the unique Palestinian situation. For example, the overburdened rural populations in the West Bank could have greater difficulty in accessing health services. The lower occurrence of CHE in the Gaza Strip and the trend towards reducing inequalities between the more vulnerable households, especially in a period of socioeconomic adversity, points to an emerging paradox of resilience in the Gaza Strip, which should be investigated carefully from the perspectives of both the health system and social lives.

Funding

None.  相似文献   
70.
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