全文获取类型
收费全文 | 4254篇 |
免费 | 697篇 |
国内免费 | 100篇 |
专业分类
耳鼻咽喉 | 42篇 |
儿科学 | 127篇 |
妇产科学 | 99篇 |
基础医学 | 197篇 |
口腔科学 | 50篇 |
临床医学 | 254篇 |
内科学 | 706篇 |
皮肤病学 | 57篇 |
神经病学 | 270篇 |
特种医学 | 46篇 |
外科学 | 456篇 |
综合类 | 526篇 |
预防医学 | 1434篇 |
眼科学 | 39篇 |
药学 | 125篇 |
2篇 | |
中国医学 | 12篇 |
肿瘤学 | 609篇 |
出版年
2024年 | 8篇 |
2023年 | 92篇 |
2022年 | 225篇 |
2021年 | 224篇 |
2020年 | 196篇 |
2019年 | 169篇 |
2018年 | 183篇 |
2017年 | 147篇 |
2016年 | 173篇 |
2015年 | 189篇 |
2014年 | 359篇 |
2013年 | 340篇 |
2012年 | 285篇 |
2011年 | 338篇 |
2010年 | 233篇 |
2009年 | 258篇 |
2008年 | 265篇 |
2007年 | 211篇 |
2006年 | 154篇 |
2005年 | 146篇 |
2004年 | 132篇 |
2003年 | 109篇 |
2002年 | 68篇 |
2001年 | 80篇 |
2000年 | 69篇 |
1999年 | 51篇 |
1998年 | 45篇 |
1997年 | 33篇 |
1996年 | 30篇 |
1995年 | 28篇 |
1994年 | 33篇 |
1993年 | 27篇 |
1992年 | 29篇 |
1991年 | 22篇 |
1990年 | 12篇 |
1989年 | 19篇 |
1988年 | 15篇 |
1987年 | 9篇 |
1986年 | 9篇 |
1985年 | 3篇 |
1984年 | 8篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1979年 | 4篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有5051条查询结果,搜索用时 15 毫秒
1.
The objective of this study was to estimate the incidence of hip fracture in the canton of Vaud, Switzerland (total population 584 000), for the period 1986–1991 using routine hospital discharge data collected by the Cantonal Service of Statistical Research and Information (SCRIS). For the survey period, the estimated average annual crude incidence rate of hip fractures was 167 per 100 000 persons aged 20 or older (241 for women and 84 for men). For the population aged 50 years or older, the crude incidence rate was 388 per 100 000 persons (546 for women and 185 for men). The average annual age-specific rates rose exponentially by successive 5-year age groups. The median age of patients at the time of the fracture was 82 years in women and 74 years in men. There was no significant difference between the total number of cervical and trochanteric fractures. Between the ages of 20 and 84 years, the cumulative risk for a woman to be admitted to hospital with a hip fracture was twice that of a man (15.8% vs 7.8%). From 1986 to 1991, the age- and sex-adjusted incidence, like the ratio of cervical to trochanteric fractures, did not show any significant trend, although it was consistent with an increase in men (p=0.09). However, the annual number of fractures rose from 644 to 776, particularly among very aged men. The mean length of stay in the acute care hospital fell from 38 days in 1986 to 25 days in 1991. Finally, the comparison of these results with those obtained in 1986 for the same population from more exhaustive sources has confirmed the provision of a consistent, although overestimated, assessment of hip fracture incidence by means of these routine hospital statistics in the canton of Vaud, Switzerland. 相似文献
2.
C Lévy-Marchal L Papoz C de Beaufort J Doutreix V Froment J Voirin P Czernichow 《Diabetic medicine》1992,9(3):279-284
The French incidence study has registered all new cases of Type 1 diabetic children under 20 years of age, from a population of 2.32 million, in an exhaustive and prospective manner. Three hundred and forty cases were identified between 1 January 1988 and 31 December 1989, yielding a mean annual incidence rate 7.3 per 10(5). The lowest rate was observed in the youngest age group (0-4 yr: 4.1 per 10(5)) and the highest around pubertal development (10-14 yr: 11.5 per 10(5)). Details of the previous personal and family history, and the clinical and biological pictures of the disease at diagnosis were recorded. Almost 8 per cent of the children had a first-degree relative with Type 1 diabetes. Polyuria, weight loss, fatigue and abdominal pain were the most frequently reported symptoms, which were of median duration 4.4 months. Mean weight loss before diagnosis was 9.4 +/- 6.8 (+/- SD)% of body weight and was not significantly related to age. Ketonuria was detected in 83.8 per cent and acidosis (total CO2 less than or equal to 18 mmol l-1, if measured) in 48 per cent of the cases. Ketonuria and acidosis were significantly more frequent in the younger age group than in the rest of the group (p less than 0.001). 相似文献
3.
W. Allen Hauser 《Epilepsia》1992,33(Z4):6-14
Summary: Age has a profound influence on our approach to the convulsive disorders. Age is a variable which is an important determinant for risk factors for epilepsy. Age, as a surrogate of brain maturation, is a determinant of the specific characteristics of the seizure disorder in those with epilepsy, and age-related changes in these manifestations can be identified. Age is a determinant for the occurrence of acute symptomatic seizures in several types of metabolic or central nervous system insults. Age is a determinant for prognosis, whether one considers remission, medication withdrawal in those entering remission, relapse following prolonged remission, or mortality. Last, age per se seems to be a risk factor for epilepsy independent of other factors. This seems particularly true for partial seizures. 相似文献
4.
K. B. Laupland M. D. Parkins T. Ross J. D. D. Pitout 《Clinical microbiology and infection》2007,13(7):683-688
The tribe Proteeae comprises the genera Proteus, Morganella and Providencia. Few studies have specifically investigated the epidemiology of infections caused by the Proteeae, and none has been conducted in a large non-selected population. The present study was a population-based laboratory surveillance in the Calgary Health Region (population 1.2 million), Canada during 2000-2005 that aimed to define the incidence, demographical risk-factors for acquisition and antimicrobial susceptibilities of Proteeae isolates. In total, 5047 patients were identified from whom Proteeae isolates were obtained (an annual incidence of 75.9/100 000), with females and the elderly being at highest risk. Incidence rates were 64.8, 7.7 and 3.4/100,000/year for the genera Proteus, Morganella and Providencia, respectively. Overall, 85% of infections were community-onset, and the overall rate of bacteraemic disease was 2.0/100,000. Compared with other species, Proteus mirabilis occurred at a much higher frequency, especially among females, and was less likely to be isolated from hospital-onset infections or to be part of a polymicrobial infection. Among isolates from community-onset infections, Providencia spp. were less likely to be from outpatients and more likely to be from nursing home residents. There were low overall rates of resistance to ciprofloxacin (4%) and gentamicin (5%), with Prot. mirabilis generally being the most susceptible. Members of the Proteeae were isolated frequently in both the community and hospital settings, but were infrequent causes of invasive disease. The occurrence, demographical risk-factors and microbiology of Proteeae isolates varied according to the individual species. 相似文献
5.
细菌性阴道病的诊断及治疗(附3594例白带检验报告) 总被引:1,自引:0,他引:1
目的:了解细菌性阴道病在妇科门诊的人群患病率及探讨治疗方法。方法:1995年6~8月对3594例妇科门诊病人按BV诊断之四项标准进行了白带化验;BV患者给予替硝唑(每日2g连续二日)夫妻同治;二周后追踪复查白带。结果:BV在妇科门诊的患病率为495%,178例BV患者中约375%无明显白带增多症状,而以不孕、腹痛、阴道流血或流产前、产后常规检查时发现。102例追踪全部治愈,追踪率为573%。结论:BV患者在妇科门诊病人中并非罕见,建议在有条件的医院应列为门诊常规检测项目。替硝唑治疗效果好,方法简便。 相似文献
6.
Hui WANG Yue ZHANG Weijie DING Yi ZHU Hongmei LU Hongni YUE Xiaochen DAI Duanhui LI Xiaoqin ZHU Xiaolin XU 《浙江大学学报(医学版)》2022,51(1):10
目的:分析2008—2020年淮安市围产儿出生缺陷的发生情况、变化趋势及其影响因素。方法:数据来源于江苏省淮安市妇幼卫生信息系统中2008—2020年的监测数据以及淮安市统计年鉴。以年度变化百分比和平均年度变化百分比(AAPC)为主要指标,采用JoinPoint回归描述十三年间淮安市出生缺陷发生的变化趋势。采用Spearman相关性分析探讨出生缺陷发生率与人口出生率、结婚登记率及高龄产妇分娩占比的相关性。结果:2008—2020年,淮安市共发生围产儿出生缺陷3414例,出生缺陷发生率为4.6‰(3414/736 608),且表现为明显的上升趋势(AAPC=8.8%, t=3.2, P<0.01),2016年为变化转折点。在24类出生缺陷中,先天性心脏病发病率急剧上升,已成为顺位第一疾病,而无脑畸形、脑膨出、脊柱裂等神经管缺陷发病率下降明显。出生缺陷率与人口出生率呈负相关( r=–0.751, P<0.01),与结婚登记率无明显相关性( r=–0.516, P>0.05),与高龄产妇分娩占比呈正相关( r=0.726, P<0.01)。 结论:2008—2020年,淮安市出生缺陷发生率整体呈上升趋势,先天性心脏病已成为第一顺位的出生缺陷,高龄产妇分娩占比与出生缺陷之间关系密切。 相似文献
7.
目的分析本院3年来3 584例剖宫产指征的构成及合理性,剖宫产指征动态变化及原因,寻找控制剖宫产率的办法,旨在进一步降低剖宫产率.方法本文对3 584例剖宫产的手术原因进行回顾性总结及分析.结果 3年来总剖宫产率49.06%,前8位指征依次为头盆不称、臀位、羊水过少、胎儿窘迫、巨大儿、脐带绕颈、社会因素、疤痕子宫.结论应加强产前检查,防治并发症,加强产科工作人员责任感,正确掌握剖宫产指征,利用社会舆论,宣传正确的分娩观. 相似文献
8.
目的比较分析阜新农村地区蒙汉两族高血压发病率及其预测因素。方法前瞻性人群随访研究。结果随访期间24.6%的汉族和34.5%的蒙族人群发展为临床高血压,但是高血压的控制率非常低(汉族1.34%,蒙族1.54%)。蒙族人群高血压年发病率为14.16/100人年[95%CI:(13.52~14.82)/100人年],汉族人群高血压年发病率为10.74/100人年[95%CI:(10.45~11.03)/100人年](P<0.05)。与汉族相比,蒙古族发展为高血压的危险比(HR)为1.131(95%CI:1.068~1.198)。女性、基线年龄、高血压前期、超重和肥胖及高血压家族史与蒙汉两族高血压发病均相关,然而饮酒只和蒙族高血压发病相关(HR:1.128;95%CI:1.045~1.219)。与有高血压家族史的汉族人群(增加12%)相比,有高血压家族史的蒙族人群发展为高血压的风险大幅提高(增加60%)。结论蒙族人群高血压发病率高于汉族人群;饮酒和高血压家族史可能是导致差异的主要原因。 相似文献
9.
Faisel H Majoko F Shebl F Lindsay P 《European journal of obstetrics, gynecology, and reproductive biology》2008,139(2):164-168
Objective
To assess trends in twinning over four decades using a population-based registry.Design
Ecological study to conduct trend analysis of twin pregnancies in a geographically defined area over 40 years.Setting
All pregnancies in the Cardiff and Vale of Glamorgan area of South Wales from 1965 to 2004, as recorded in the Cardiff Birth Survey (CBS) database.Methods
Trends of the incidence of all twin pregnancies (≥18 weeks of gestation) were calculated in 5-year increments, beginning with 1965–1969 and ending in 2000–2004. Natural twinning rates could only be calculated for the terminal five time periods (i.e., 1980–1984, 1985–1989, 1990–1994, 1995–1999, and 2000–2004), when information regarding non-spontaneous (iatrogenic) twinning was first collected in the database. All results were adjusted for maternal age.Results
The total twinning rate was 13.1 per 1000 pregnancies in the 1st time period (1965–1969). Subsequently, there was a gradual reduction in twinning, reaching a nadir of 10.3 per 1000 for the time period 1980–1985 (Z = 3.15, P value < 0.001). This was followed by a gradual increase in twinning, reaching a maximum of 15.7 per 1000 for both 1995–1999 and 2000–2004 (Z = −5.18, P value < 0.0001). After exclusion of the cases of iatrogenic pregnancies, the natural twinning rate showed a continuous and gradual increase from 10 per 1000 spontaneous pregnancies in 1980–1984 to 13.3 per 1000 in 2000–2004 (Z = −5.08, P value < 0.0001).Conclusion
The data showed a gradual, continuous increase in natural twinning rates over the last two decades. Such an increase cannot be attributed to the rise in maternal age alone. 相似文献10.
BackgroundThe epidemic of type 2 diabetes mellitus (T2DM) poses a great challenge to pulmonary tuberculosis (PTB) control. However, the incidence and prevalence of PTB among T2DM patients has not been fully determined. This meta-analysis aimed to provide the estimation on the global incidence and prevalence of PTB among T2DM patients (T2DM-PTB).MethodsOnline databases including Web of Science, PubMed, China National Knowledge Infrastructure and Cochrane Library were searched for all relevant studies that reported the incidence or prevalence of T2DM-PTB through 31 January 2022. Pooled incidence and prevalence of T2DM-PTB with 95% confidence interval (CI) was estimated by the random-effect model. All statistical analyses were performed using R software.ResultsA total of 24 studies (14 cohort studies, 10 cross-sectional studies) were included. The pooled incidence and prevalence of T2DM-PTB were 129.89 per 100,000 person-years (95% confidence interval (CI): 97.55–172.95) and 511.19 per 100,000 (95% CI: 375.94–695.09), respectively. Subgroup analyses identified that the incidence of T2DM-PTB was significantly higher in Asia (187.20 per 100,000 person-years, 95% CI: 147.76–237.17), in countries with a high TB burden (172.04 per 100,000 person-years, 95% CI: 122.98–240.68) and in studies whose data collection ended before 2011 (219.81 per 100,000 person-years, 95% CI: 176.15–274.28), but lower in studies using International Classification of Diseases-10 codes (73.75 per 100,000 person-years, 95% CI: 40.92–132.91). The prevalence of T2DM-PTB was significantly higher in countries with a high TB burden (692.15 per 100,000, 95% CI: 468.75–1022.04), but lower in Europe (105.01 per 100,000, 95% CI: 72.55–151.98).ConclusionsThis systematic review and meta-analysis suggests high global incidence and prevalence of PTB among T2DM patients, underlining the necessity of more preventive interventions among T2DM patients especially in countries with a high TB-burden.
Key messages
- A total of 24 studies (14 cohort studies, 10 cross-sectional studies) containing 2,569,451 T2DM patients were included in this meta-analysis.
- The pooled incidence and prevalence of T2DM-PTB are 129.89 per 100,000 person-years (95% CI: 97.55–172.95) and 511.19 per 100,000 (95% CI: 375.94–695.09) respectively.
- The incidence of T2DM-PTB was significantly higher in Asia, in countries with a high TB burden and in studies whose data collection ended before 2011, but lower in studies using International Classification of Diseases-10 codes.
- The prevalence of T2DM-PTB was significantly higher in countries with a high TB-burden, but lower in Europe.