全文获取类型
收费全文 | 5161篇 |
免费 | 483篇 |
国内免费 | 23篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 259篇 |
妇产科学 | 178篇 |
基础医学 | 618篇 |
口腔科学 | 76篇 |
临床医学 | 668篇 |
内科学 | 1091篇 |
皮肤病学 | 56篇 |
神经病学 | 420篇 |
特种医学 | 637篇 |
外科学 | 599篇 |
综合类 | 119篇 |
一般理论 | 10篇 |
预防医学 | 379篇 |
眼科学 | 32篇 |
药学 | 270篇 |
中国医学 | 4篇 |
肿瘤学 | 231篇 |
出版年
2022年 | 43篇 |
2021年 | 69篇 |
2020年 | 36篇 |
2019年 | 50篇 |
2018年 | 69篇 |
2017年 | 47篇 |
2016年 | 58篇 |
2015年 | 87篇 |
2014年 | 126篇 |
2013年 | 168篇 |
2012年 | 186篇 |
2011年 | 198篇 |
2010年 | 182篇 |
2009年 | 139篇 |
2008年 | 181篇 |
2007年 | 173篇 |
2006年 | 163篇 |
2005年 | 181篇 |
2004年 | 171篇 |
2003年 | 149篇 |
2002年 | 164篇 |
2001年 | 112篇 |
2000年 | 136篇 |
1999年 | 135篇 |
1998年 | 178篇 |
1997年 | 151篇 |
1996年 | 165篇 |
1995年 | 129篇 |
1994年 | 125篇 |
1993年 | 119篇 |
1992年 | 105篇 |
1991年 | 117篇 |
1990年 | 101篇 |
1989年 | 135篇 |
1988年 | 120篇 |
1987年 | 133篇 |
1986年 | 108篇 |
1985年 | 128篇 |
1984年 | 82篇 |
1983年 | 70篇 |
1982年 | 65篇 |
1981年 | 52篇 |
1980年 | 61篇 |
1979年 | 51篇 |
1978年 | 52篇 |
1977年 | 37篇 |
1976年 | 53篇 |
1975年 | 45篇 |
1974年 | 29篇 |
1973年 | 37篇 |
排序方式: 共有5667条查询结果,搜索用时 546 毫秒
1.
CDC's consensus set of health status indicators: monitoring and prioritization by state health departments.
下载免费PDF全文
![点击此处可从《American journal of public health》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A survey assessed the extent to which state health departments monitor and prioritize the Centers for Disease Control and Prevention's consensus set of health status indicators. A response rate of 100% was obtained. Although mortality indicators are often monitored, only 75.5% of the states monitor work-related injury deaths. Most states monitor the incidence of acquired immunodeficiency syndrome, measles, tuberculosis, and syphilis. Low birthweight, births to adolescents, and lack of prenatal care are monitored in nearly all states and are considered high-priority problems. Only 46.9% of states are monitoring poor air quality, and only 58.8% are monitoring childhood poverty. Survey results suggest a need for standardized assessment of indicators for policy development and program planning. 相似文献
2.
3.
JA HYEON KU CHEOL KWAK SEUNG-JUNE OH EUNSIK LEE SANG EUN LEE JAE-SEUNG PAICK 《International journal of urology》2004,11(7):489-493
BACKGROUND: Our aims in the present study were to estimate the influences of pain and urinary symptoms on quality of life, and to determine which of these two variables has the most predictive power with respect to quality of life in young men with chronic prostatitis-like symptoms. METHODS: Chronic prostatitis-like symptoms were measured by the National Institutes of Health-Chronic Prostatitis Symptom Index. Of the 28,841 men aged 20 years who lived in the study community, 18,495 men (a response rate 64.1%) agreed to participate in the study. A total of 1057 men who complained of symptoms indicative of chronic prostatitis were included in the study. The influences of pain and urinary symptoms on quality of life were determined using logistic regression analysis. The receiver operating characteristic (ROC) curve was used to estimate the predictive ability of each of these variables with respect to quality of life. RESULTS: Results from multivariate analysis showed that both pain and urinary symptoms were associated with an increased likelihood of impaired quality of life, although pain contributed more to a reduced quality of life than urinary symptoms. Relative to men who experienced mild pain, men who experienced moderate pain had a 3.9-fold risk of poor quality of life (odds ratio [OR], 3.87; 95% confidence interval [CI], 2.86-5.23; P < 0.001) and those who experienced severe pain had a 15.7-fold risk of reduced quality of life (OR, 15.68; 95% CI, 6.59-37.35; P < 0.001). Moderate urinary symptoms were associated with a 1.4-fold risk of bother (OR, 1.41; 95% CI, 1.01-1.99; P < 0.001) and severe urinary symptoms were associated with 2.4-fold risk (OR, 2.39; 95% CI, 1.37-4.12; P < 0.001), relative to mild urinary symptoms. Comparison of the effects of pain and urinary symptoms showed that pain severity had the most predictive power for bother, quality of life, and quality-of-life impact. The areas under the ROC curves for bother, quality of life, and quality-of-life impact were 71.3%, 69.3% and 72.5%, respectively. CONCLUSION: Urinary symptoms and pain might be associated with an increased likelihood of impaired quality of life in young men with chronic prostatitis-like symptoms. In addition, our findings suggest that pain severity is the most influential variable for determining quality of life in this population. 相似文献
4.
Philip S Wells Josdalyne L Anderson Marc A Rodger Nancy Carson Rebecca L Grimwood Steve P Doucette 《Blood coagulation & fibrinolysis》2006,17(7):533-538
The substitution of leucine for valine at amino acid position 34 of the factor XIII gene is commonly referred to as FXIII Val34Leu polymorphism. The homozygous leucine/leucine genotype has been reported to confer protection against venous thromboembolism, but previous studies have not evaluated a population limited to those with idiopathic venous thromboembolism. The primary objective of the study was to determine whether the FXIII Val34Leu polymorphism is independently associated with the occurrence of idiopathic venous thromboembolism. We prospectively enrolled consecutive patients with at least one objectively confirmed idiopathic venous thromboembolism. Friends of cases were recruited as controls and matched to cases by sex, ethnicity, and age. All participants were tested for the FXIII Val34Leu polymorphism in addition to several well-known thrombophilias. Data from 309 cases and 306 controls were analyzed. The FXIII leucine/leucine genotype was present in 4.9% of cases and 6.5% of controls. An adjusted odds ratio of 0.59 (95% confidence interval, 0.25-1.38) was found for the recessive model and 0.69 (95% confidence interval, 0.46-1.02) for the dominant model. Our results do not support an independent association of the FXIII Val34Leu polymorphism with idiopathic venous thromboembolism in our Caucasian Canadian study population. 相似文献
5.
6.
7.
8.
D K Carson J R Council J E Gravley 《Journal of developmental and behavioral pediatrics : JDBP》1991,12(3):141-147
Findings from a study of 47 children 4 to 12 years old who received tonsillectomies at a children's hospital indicated that adjustment before hospitalization was the strongest predictor of postsurgical adjustment. However, certain temperamental and mother-child relationship factors also were strongly related to and predictive of posthospitalization outcomes. Children who displayed the most positive reactions were temperamentally more rhythmical (i.e., had regular, predictable behavior), more approaching to new experiences and people, more adaptable to change and positive in mood, and more responsive. Although family adaptability and cohesion were not significantly associated with children's reactions to hospitalization, maternal trait anxiety and maternal overprotection, rejection, and overindulgence of the child were correlated with poorer adjustment. The findings have practical implications to helping children adjust more effectively to surgery and hospitalization, and they contribute to our understanding of resiliency and vulnerability in children. 相似文献
9.
10.