全文获取类型
收费全文 | 61901篇 |
免费 | 6895篇 |
国内免费 | 1720篇 |
专业分类
耳鼻咽喉 | 412篇 |
儿科学 | 1522篇 |
妇产科学 | 1386篇 |
基础医学 | 4231篇 |
口腔科学 | 1527篇 |
临床医学 | 7416篇 |
内科学 | 9934篇 |
皮肤病学 | 777篇 |
神经病学 | 3918篇 |
特种医学 | 993篇 |
外国民族医学 | 7篇 |
外科学 | 5757篇 |
综合类 | 10044篇 |
现状与发展 | 8篇 |
一般理论 | 1篇 |
预防医学 | 11070篇 |
眼科学 | 1096篇 |
药学 | 4217篇 |
49篇 | |
中国医学 | 1636篇 |
肿瘤学 | 4515篇 |
出版年
2024年 | 115篇 |
2023年 | 1190篇 |
2022年 | 2132篇 |
2021年 | 3225篇 |
2020年 | 3253篇 |
2019年 | 2365篇 |
2018年 | 2384篇 |
2017年 | 2470篇 |
2016年 | 2811篇 |
2015年 | 2527篇 |
2014年 | 4754篇 |
2013年 | 5229篇 |
2012年 | 4417篇 |
2011年 | 4492篇 |
2010年 | 3461篇 |
2009年 | 3125篇 |
2008年 | 2963篇 |
2007年 | 2910篇 |
2006年 | 2518篇 |
2005年 | 2192篇 |
2004年 | 1741篇 |
2003年 | 1510篇 |
2002年 | 1264篇 |
2001年 | 1099篇 |
2000年 | 901篇 |
1999年 | 700篇 |
1998年 | 592篇 |
1997年 | 523篇 |
1996年 | 394篇 |
1995年 | 417篇 |
1994年 | 390篇 |
1993年 | 298篇 |
1992年 | 303篇 |
1991年 | 287篇 |
1990年 | 216篇 |
1989年 | 196篇 |
1988年 | 173篇 |
1987年 | 130篇 |
1986年 | 124篇 |
1985年 | 142篇 |
1984年 | 121篇 |
1983年 | 74篇 |
1982年 | 85篇 |
1981年 | 66篇 |
1980年 | 53篇 |
1979年 | 48篇 |
1978年 | 30篇 |
1977年 | 24篇 |
1976年 | 34篇 |
1975年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Tryntsje Fokkema Robert Burggraaff Fred Hartgens Bas Kluitenberg Evert Verhagen Frank J.G. Backx Henk van der Worp Sita M.A. Bierma-Zeinstra Bart W. Koes Marienke van Middelkoop 《Journal of Science and Medicine in Sport》2019,22(3):259-263
Objectives
To investigate the prognosis and possible prognostic factors of running-related injuries (RRIs) in novice runners.Design
Prospective cohort study.Methods
Participants of Start to Run, a 6-weeks course for novice runners in The Netherlands, were asked to participate in this study. Before the start of the course a baseline questionnaire, on demographics, physical activity and perceived health, was sent to runners willing to participate. The 26- or 52-weeks follow-up questionnaires assessed information on RRIs and their duration. Only participants that sustained a RRI during follow-up were included in the analyses. An injury duration of 10 weeks or shorter was regarded as a relatively good prognosis, while an injury duration of more than 10 weeks was defined as a poor prognosis. To determine the associations between baseline characteristics and injury prognosis and between injury location and injury prognosis, multivariable logistic regression analyses were performed.Results
347 participants (48.8%) sustained an RRI during follow-up. The RRIs had an overall median duration of eight weeks (range: 1–52 weeks). Participants with a previous RRI were more likely to have a poor prognosis (OR 2.31; 95%CI 1.12–4.79), while a calf injury showed a trend towards an association with a relatively good prognosis (OR 0.49; 95%CI 0.22–1.11).Conclusions
The duration of RRIs in novice runners is relatively long, with only calf injuries being associated with a good prognosis. This emphasizes the need of injury prevention measures in novice runners and adequate support during and after an RRI, especially in runners with a previous injury. 相似文献72.
《Revista portuguesa de cardiologia》2019,38(8):583-593
Introduction and ObjectivesSmoking patterns inform tobacco control policies. This study aimed to assess trends in smoking prevalence and associated socioeconomic factors in Portugal between 1987 and 2014.MethodsWe used data from National Health Interview Surveys (NHIS) conducted in 1987, 1995/96, 1998/99, 2005/06 and 2014/15. For each NHIS, we estimated gender-specific and age-standardized smoking prevalences, stratified by education, occupation, marital status and region. We constructed NHIS- and gender-specific logistic regression models, adjusting for the above-mentioned variables. We describe changes in smoking prevalence and inequalities in associated socioeconomic factors between 1987 and 2014.ResultsIn men, smoking prevalence (32.2% and 26.7%, respectively) and inequalities for all factors except for education decreased between 1987 and 2014. For women, inequalities decreased for region, age and occupation, and these changes occurred through increasing smoking prevalence in all groups. For marital status and education, inequalities were stable but smoking prevalence increased for all groups within these variables. In both sexes, the unemployed (adjusted odds ratio [aOR] 2014: men 2.33, women 2.76) and divorced (aOR 2014: men 2.12, women 3.18) consistently had the highest prevalences and aORs of smoking. For the first three NHIS higher aORs of smoking were observed among less-educated men and highly-educated women, while for the last two the higher odds were for the less-educated in both sexes.ConclusionsSmoking trends among men showed decreasing prevalences and diminishing inequalities. For women, inequalities were stable but there was an overall increase in prevalence. The unemployed and divorced had the highest smoking prevalences in both sexes. Smoking prevention and cessation policies in Portugal should take into consideration inequalities, particularly among men, and increasing consumption among women. 相似文献
73.
目的探讨职业倦怠的主要影响因素及与教学质量的相关性。方法对97名参与临床教学的医护人员进行调查,分析职业倦怠现状、影响因素,及职业倦怠与教学质量的相关性。结果97名临床教师中,存在轻度倦怠41例(42.27%),中度倦怠23例(23.71%),重度倦怠9例(9.28%),合计共有73名临床教师存在职业倦怠(75.26%)。女性情感耗竭维度得分高于男性(P<0.05)。不同职称者情感耗竭、人格解体和成就感降低3个维度得分均差异有统计学意义(P<0.05)。多因素Logistic回归分析结果显示:婚姻状况和职称为职业倦怠的风险因素(P<0.05)。轻度倦怠与重度倦怠者社会支持利用度得分差异有统计学意义(P<0.01)。Spearman等级相关分析结果显示:职业倦怠程度与教学质量评议分数无相关性(P>0.05),职称与教学质量评议分数有正相关关系(P<0.05)。结论临床教师职业倦怠强度与职称、婚姻状况有关。临床教师职称与教学质量正相关。 相似文献
74.
75.
目的对肺占位病灶行CT引导下经皮肺穿刺活检(CT-guided percutaneous transthoracic needle biopsy,PTNB),利用CT评估肺出血风险的危险因素。方法对行PTNB的1174例患者(1226个病灶)进行回顾性分析。通过对患者信息、病灶特征、穿刺情况、病理结果等相关影响因素进行单变量和多变量分析,评估总体肺出血、较严重肺出血危险因素。结果术后肺出血发生率为63.5%(779/1226),其中较严重出血率为20.5%(251/1226),多因素分析结果:病灶(≤1cm)、穿刺路径较长、病灶有血管穿行、mGGO、pGGO,是较严重肺出血的危险因素,CT净增强值是肺出血独立危险因素,但不是较严重出血的独立危险因素。肺动脉高压(PAH)评估中,mPAD≥2.95cm、mPAD/AAD>1不是肺出血及较严重出血的危险因素。药物预防性止血、2级气胸是较严重肺出血的保护因素。结论在针对小而穿刺路径长的病灶,周围穿行血管丰富的病灶,表现为GGO的肺内病灶行PTNB,应警惕和避免较严重肺出血。CT净增强值较高部位取材相对安全。肺动脉高压不是肺出血及较严重出血的危险因素。少量气胸可以缓解肺出血的进一步加重。 相似文献
76.
库尔班·买买提艾力 艾尼·奥斯曼 赵信德 麦路德木·麦麦吐逊 比拉力·巴拉江 麦麦提图尔荪·阿不杜拉 穆扎帕尔江·穆太力甫 阿吉木·库尔班 刘正清 《国际脑血管病杂志》2022,30(3):190-193
77.
目的 了解农村老年人的老化期望现状,分析其影响因素,为针对干预提供参考。
方法 采用一般资料调查表、UCLA孤独感量表简化版、老化期望量表、简版自我感知老化量表对199名农村老年人进行问卷调查。
结果 老化期望总分为32.72±9.18,孤独感得分为15.11±3.82,自我感知老化得分为52.75±2.76;多元线性回归分析显示,性别、婚姻状况、患慢性病种数、独居、孤独感、自我感知老化及经济来源是农村老年人老化期望的影响因素(调整R2=0.612,均P<0.05)。
结论 农村老年人的老化期望水平较低,女性、孤独、无配偶、患慢性病较多、老化态度消极及低收入人群是关注的重点。 相似文献
78.
目的研究慢阻肺急性加重期患者延迟就医与家庭动力学的相关性,希望能够为慢阻肺急性加重期患者拟定护理措施提供科学依据。方法选取2017年1月-2019年12月我院240例诊断为慢阻肺急性加重期的患者为研究对象。根据患者入院就医的时间进行分组,时间≥24h的延迟就医的患者为观察组,时间<24h的及时就医患者为对照组。结果两组患者在文化水平、家庭年收入、在职状态、医疗保险和婚姻状况和APACHEⅡ评分比较(P<0.05)。观察组患者疾病观念、个性化、系统逻辑和家庭氛围得分比对照组高(P<0.05)。Pearman的相关性分析结果显示:慢阻肺急性加重期患者延迟就医时间与各个层面分数以及家庭动力总分呈现负相关性(P<0.05)。应变量为延迟就医为应变量,患者的一般资料为自变量,经Logistic回归分析结果表明:延迟就医的影响因素为文化水平、家庭动力评分、职业状态、家庭收入、婚姻状况和APACHEⅡ评分。结论慢阻肺急性加重期患者家庭动力总分与疾病观念、个性化、系统逻辑和家庭氛围得分与延迟就医时间呈现负相关性,患者延迟就医的影响因素是家庭动力学评分。 相似文献
79.
目的探讨关节镜清理术联合透明质酸钠治疗膝骨性关节炎患者的效果。方法100例膝骨性关节炎患者随机分为两组各50例,对照组采用关节镜清理术治疗,实验组采用关节镜清理术联合透明质酸钠治疗,比较两组的关节液炎性因子水平、膝关节功能以及疼痛情况。结果治疗后,实验组的TNF-α、IL-6、IL-8水平均显著低于对照组(P<0.05)。治疗1个月、3个月、6个月后,实验组的Lysholm评分均显著高于对照组,VAS评分均显著低于对照组(P<0.05)。结论关节镜清理术联合透明质酸钠治疗膝骨性关节炎可降低患者关节液炎性因子水平,改善膝关节功能,减轻疼痛。 相似文献
80.
《European journal of surgical oncology》2022,48(11):2346-2351
In the pelvis, anatomic complexity and difficulty in visualization and access make surgery a formidable task. Surgeons are prone to work-related musculoskeletal injuries from the frequently poor design and flow of their work environment. This is exacerbated by the strain of surgery in the pelvis. These injuries can result in alterations to a surgeons practice, inadvertent patient injury, and even early retirement. Human factors examines the relationships between the surgeon, their instruments and their environment. By bridging physiology, psychology, and ergonomics, human factors allows a better understanding of some of the challenges posed by pelvic surgery. The operative approach involved (open, laparoscopic, robotic, or perineal) plays an important role in the relevant human factors. Improved understanding of ergonomics can mitigate these risks to surgeons. Other human factors approaches such as standardization, use of checklists, and employing resiliency efforts can all improve patient safety in the operating theatre. 相似文献