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   10855篇
  免费   1521篇
  国内免费   43篇
耳鼻咽喉   103篇
儿科学   133篇
妇产科学   61篇
基础医学   568篇
口腔科学   416篇
临床医学   2481篇
内科学   3154篇
皮肤病学   45篇
神经病学   1387篇
特种医学   136篇
外科学   399篇
综合类   313篇
一般理论   2篇
预防医学   2231篇
眼科学   75篇
药学   457篇
  1篇
中国医学   35篇
肿瘤学   422篇
  2024年   33篇
  2023年   519篇
  2022年   444篇
  2021年   813篇
  2020年   777篇
  2019年   884篇
  2018年   762篇
  2017年   761篇
  2016年   640篇
  2015年   546篇
  2014年   644篇
  2013年   1276篇
  2012年   469篇
  2011年   456篇
  2010年   369篇
  2009年   415篇
  2008年   399篇
  2007年   345篇
  2006年   290篇
  2005年   252篇
  2004年   212篇
  2003年   176篇
  2002年   220篇
  2001年   180篇
  2000年   79篇
  1999年   73篇
  1998年   58篇
  1997年   58篇
  1996年   45篇
  1995年   28篇
  1994年   30篇
  1993年   18篇
  1992年   26篇
  1991年   17篇
  1990年   12篇
  1989年   13篇
  1988年   7篇
  1987年   6篇
  1986年   9篇
  1985年   7篇
  1984年   7篇
  1983年   7篇
  1982年   10篇
  1981年   8篇
  1979年   4篇
  1978年   4篇
  1977年   3篇
  1975年   3篇
  1971年   1篇
  1967年   1篇
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
91.
ObjectiveBoth high-intensity interval training (HIIT) and resistance exercises (R) are used in cardiac rehabilitation in patients with coronary artery disease (CAD). However, the combined effect of an HIIT + R exercise program in older adults with CAD is not well investigated. The study's purpose was to assess the changes in anthropometric parameters, physical activity, functional capacity, physiological parameters, and quality of life (QoL) in this population following a combined HIIT + R program.DesignThe study was a 2-group (n = 45 each) randomized controlled single-blinded trial.Setting and ParticipantsThe study was done at a treatment clinic of a tertiary hospital. The mean age of participants was 69.23 ± 4.9 years. The HIIT + R group performed 8 sessions (1/wk) of HIIT + R training. The 30 minutes of the active exercise phase consisted of ten 3-minute bouts. Each bout comprised of 1 minute of high-intensity treadmill walking at 85% to 90% maximum heart rate (MHR), followed by a low-intensity walking at 60%-70% MHR, followed by low-to moderate-intensity resistance training. The Usual Care group underwent conventional medical treatment.MeasuresAnthropometric measurements [weight, body mass index (BMI), waist circumference, body fat percentage, lean body mass], physical activity (International Physical Activity Questionnaire), functional capacity (Incremental Shuttle Walking Test), physiologic measurements (blood pressure, heart rate), and QoL (36-Item Short Form Health Survey) were measured pre- and postintervention.ResultsSignificant group and time interaction were found for the participants in the HIIT + R Group for BMI (P = .001), body fat percentage (P = .001), waist circumference (P < .001), physical activity (P < .001), functional capacity (P < .001), and QoL (P = .001) compared with the UC Group. Significant improvement in systolic blood pressure (P = .001) was seen in the HIIT + R group.Conclusions and ImplicationsA combined HIIT + R training protocol in older adults with CAD can be useful in producing desired health outcomes. Further evaluation of longer duration exercise programs with more frequent dosing needs to be evaluated for their benefits and sustainability.  相似文献   
92.
ObjectivesTo (1) estimate incidence, trends, and determinants of government-subsidized diagnostic radiography (ie, plain x-ray) services utilization by Australian long-term care facility (LTCF) residents between 2009 and 2016; (2) examine national variation in services used.DesignA repeated cross-sectional study.Setting and ParticipantsAustralian LTCF residents who were ≥65 years old.MethodsMedicare Benefits Schedule subsidized plain x-rays employed for diagnosing fall-related injuries, pneumonia, heart failure, and acute abdomen or bowel obstruction were identified. Yearly sex- and age-standardized utilization rates were calculated. Poisson and negative binomial regression models were employed. Facility-level variation was examined graphically. Overall and examination site–specific analyses were conducted.ResultsA total of 521,497 LTCF episodes for 453,996 individuals living in 3018 LTCFs were examined. The median age was 84 years (interquartile range 79-88), 65% (n = 339,116) were women, and 53.9% (n = 281,297) had dementia. In addition, 34.5% (n = 179,811) of episodes had at least one x-ray service. Overall, there was a 12% increase in utilization between 2009 and 2016 (from 535/1000 in 2009 to 602/1000 person-years in 2016, incidence rate ratio=1.02, 95% confidence interval 1.02-1.02). Factors associated with x-ray use included being 80-89 years old, being a man, not having dementia, having multiple health conditions (4-6 or ≥7 compared to 0-3), being at a smaller facility (0-24 bed compared to 50-74), facility located in the Australian state of New South Wales, or in major cities (compared to regional areas). National variation in x-ray service use, with largest differences observed by state, was detected.Conclusions and ImplicationsPlain x-ray service utilization by LTCF residents increased 12% between 2009 and 2016. Sex, age, dementia status, having multiple health conditions as well as facility size, and location were associated with plain x-ray use in LTCFs and use varied geographically. Differences in x-ray service utilization by residents highlight lack of consistent access and potential over- or underutilization.  相似文献   
93.
BackgroundObesity imposes risk to cardiometabolic health; however, intentional weight loss among older adults with obesity remains controversial.ObjectiveTo explore the influence of exercise plus weight maintenance and exercise plus intentional weight loss by caloric restriction on changes in cardiometabolic risk among older adults with obesity assessed by four risk-scoring tools.DesignUsing longitudinal data from the Calorie Restriction and Changes in Body Composition, Disease, Function, and Quality of Life in Older Adults study (CROSSROADS) (ClinicalTrials.gov identifier: NCT00955903; May 2009 to October 2014), scores were calculated using baseline and 12-month data according to criteria from the International Diabetes Federation, National Cholesterol Education Program's Adult Treatment Panel, Framingham Risk Score, and Cardiometabolic Disease Staging.Participants and settingParticipants (39% men, 23% African American, aged 70.2 ± 4.7 years) were randomized to exercise (n = 48), exercise plus nutrient-dense weight maintenance diet (n = 44), or exercise plus weight loss by moderate caloric restriction (n = 42).Main outcome measuresTo evaluate effects of exercise plus weight maintenance and exercise plus intentional weight loss on changes in cardiometabolic risk.Statistical analyses performedGeneralized estimating equations were used to assess changes in risk with ethnicity, biological sex, and age as covariates.ResultsGroup-time interaction was only significant for Framingham and Cardiometabolic Disease Staging (P = 0.005 and 0.041, respectively). Upon post hoc analysis, significant within-group improvements in Framingham scores were observed for exercise plus weight maintenance (P < 0.001; r = –1.682) and exercise plus weight loss (P = 0.020; r = –0.881). In analysis of between-group differences in Framingham scores, significant decreases were observed in the exercise plus weight maintenance group (P = 0.001; r = –1.723) compared with the exercise group. For Cardiometabolic Disease Staging, the exercise plus weight loss group had significant within-group improvements (P = 0.023; r = –0.102). For between-group differences in Cardiometabolic Disease Staging, the exercise plus weight loss group showed significant risk reduction (P = 0.012; r = –0.142) compared with the exercise group.ConclusionsAmong risk scores evaluated, Framingham and Cardiometabolic Disease Staging showed significantly greater sensitivity to change in cardiometabolic risk. Older adults with obesity can significantly lower cardiometabolic risk through exercise plus weight maintenance or exercise plus weight loss by moderate caloric restriction.  相似文献   
94.
针对护理心理学的学科属性和成人高等护理教育的特点,结合8年来护理心理学的教学经验,总结出了教学应强调专业教育和素质教育相结合,努力提高护理心理学教育的整体水平。  相似文献   
95.
目的汉化痴呆恐惧量表,并在社区老年人中检验其信效度。方法根据Brislin翻译原则翻译痴呆恐惧量表,通过专家咨询和预试验进行文化调适,采用便利抽样法选取230名社区老年人进行问卷调查,检验中文版量表的信度和效度。结果中文版痴呆恐惧量表包含认知、社会和躯体3个维度,涉及痴呆症的体验与认识(7个条目)、担心家庭负担(4个条目)、羞耻感(3个条目)和躯体反应(4个条目)4个因子共18个条目。量表内容效度指数为0.934,各条目内容效度指数为0.857~1.000;探索性因子分析共提取4个公因子,累积方差贡献率为77.464%;总量表Cronbach′sα系数为0.893,重测信度为0.854。结论中文版痴呆恐惧量表在社区老年人中应用信效度较好,可用于老年人痴呆恐惧的识别和评估。  相似文献   
96.
BackgroundThe aim of this study was to evaluate the association between age and disease specific mortality (DSM) among adults diagnosed with medullary thyroid cancer (MTC).MethodSurveillance, Epidemiology, and End Results (SEER-18) was used to analyze adult MTC patients stratified by age (18–64, 65–79, ≥80 years). Associations between patient demographics, tumor size, nodal status, metastatic disease, and extent of surgery on DSM was assessed with multivariable Cox regression.ResultsAmong 1457 patients with MTC, 1008 (69.2%) were younger adults, 371 (25.5%) older adults, and 78 (5.4%) were super-elderly. A significantly higher proportion of older adults and super-elderly had less than the recommended operation for MTC. On multivariable analysis, older adults and super-elderly were 2.9 and 6.7 times more likely to have an increased DSM (HR:2.91, 95% CI: 1.83–4.63; p < 0.001 and HR: 6.70, 95%CI: 3.69–12.20; p < 0.001). Extent of surgery or lymphadenectomy did not affect DSM.ConclusionsIncreased age is an independent predictor of DSM in patients with MTC.  相似文献   
97.
BackgroundBariatric surgery has become widely performed for treating patients with morbid obesity, and the age limits are being pushed further and further as the procedure proves safe. After massive weight loss, many of those patients seek body-contouring surgery for excess skin and fat.ObjectivesTo analyze the feasibility and the safety of abdominoplasty in patients older than 55 years old after bariatric surgery.SettingUniversity hospital medical center.MethodsWe performed a retrospective review of prospectively collected data from patients aged older than 55 years who had undergone abdominoplasty following massive weight loss due to a bariatric surgery at a single institution from 2004 to 2017. The data analyzed included age, gender, preoperative body mass index, associated interventions, co-morbidities, and postoperative complications.ResultsWe retrieved records for 104 patients; 85.6% percent of them were female, and the mean age was 60.1 ± 3.9 years old. Of the 104 patients, 21 (20.2%) underwent a sleeve gastrectomy and 77 (74%) underwent a Roux-en-Y gastric bypass. The mean interval between the bariatric surgery and the abdominoplasty was 33.6 ± 26.9 months. The mean preoperative weight and body mass index were 76.1 ± 14.5 kg and 28.9 ± 4.5 kg/m2, respectively. A total complication rate of 20% was observed. The only factor significantly associated with postoperative morbidity was the associated procedure (P = .03), when we performed another procedure at the same time as the abdominoplasty. Complications included postoperative bleeding in 5 patients (4.8%), seromas in 5 patients (4.8%), surgical site infections in 12 patients (11.5%), and wound dehiscence or ischemia in 2 patients (1.9%). No mortality occurred.ConclusionAbdominoplasty can be safely performed in carefully selected patients older than 55 years old after weight loss surgery, and does not present increased morbidity or mortality. We recommend that surgeons avoid adding concomitant procedures when possible, to decrease the risk of complications. It is also important to look at the patient’s previous maximum BMI levels, as a higher maximum BMI can predict higher postoperative risks and longer hospital stays.  相似文献   
98.
BackgroundBreast cancer in young women is associated with unfavourable tumour biology and is the main cause of death in this group. Conditional survival analysis estimates survival rates under the pre-condition of already having survived a certain time.ObjectivesTo describe conditional disease-free and overall survival of female breast cancer patients according to clinical subtypes and age.MethodsThis study analyses information from 1,858 breast cancer patients aged between 21 and 54 years, who were taking part in a post-therapeutic rehab programme (time between diagnosis and rehab start: maximum 24, median 11 months). Mean follow-up time was 3.6 years. We describe biological, clinical and pathological features in regard to different age groups (<40 and ≥40 years) and report conditional 5-year survival rates for overall and disease-free survival, and Cox proportional hazard models.ResultsVery young and young patients differed in regard to hormone receptor negativity, tumour grade, lymphovascular invasion, and molecular subtypes. Young women bore triple-negative and HER2-like disease more frequently. Conditional 5-year overall survival did not differ substantially between women <40 and 40–54 years of age (95 vs. 96%). It was highest for women with cancer of the luminal A subtype (98%) and lowest for the triple-negative subtype (91%). Lymphangiosis was a significant predictor of death. Results for disease-free survival were comparable.ConclusionsConditional 5-year overall survival after non-metastatic breast cancer was as high as 95.5%, and disease-free survival was 85.2%. When controlling for time between diagnosis and rehab start, molecular subtypes influenced overall and disease-free survival prospects. When additionally controlling for clinical characteristics, this effect only remained stable for disease-free survival.  相似文献   
99.
100.
ObjectiveThe aim of this study is to compare health promotion policies (HPP) for older adults in four European countries: Germany, Italy, the Netherlands and Poland. We focus on the design, regulations and implementation of policies in these countries.MethodAs policy relevant information is mostly available in national languages we have approached experts in each country. They filled in a specially designed questionnaire on the design, regulation and implementation of health promotion policies. To analyze the data collected via questionnaires, we use framework analyses. For each subject we define several themes.ResultsRegarding regulations, Poland and Italy have a top-down regulation system for health promotion policy. Germany and Netherlands have a mixed system of regulation. Regarding the scope of the policy, in all four countries both health promotion and prevention are included. Activities include promotion of a healthy life style and social inclusion measures. In Poland and Italy the implementation plans for policy measures are not clearly defined. Clear implementation plans and budgeting are available in Germany and the NetherlandsConclusionsIn all four countries there is no document that exclusively addresses health promotion policies for older adults. We also found that HPP for older adults appears to be gradually disappearing from the national agenda in all four countries.  相似文献   
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