全文获取类型
收费全文 | 8513篇 |
免费 | 619篇 |
国内免费 | 16篇 |
专业分类
耳鼻咽喉 | 153篇 |
儿科学 | 207篇 |
妇产科学 | 180篇 |
基础医学 | 1013篇 |
口腔科学 | 169篇 |
临床医学 | 1075篇 |
内科学 | 1529篇 |
皮肤病学 | 119篇 |
神经病学 | 723篇 |
特种医学 | 223篇 |
外国民族医学 | 2篇 |
外科学 | 1272篇 |
综合类 | 138篇 |
一般理论 | 11篇 |
预防医学 | 983篇 |
眼科学 | 237篇 |
药学 | 620篇 |
中国医学 | 12篇 |
肿瘤学 | 482篇 |
出版年
2023年 | 49篇 |
2022年 | 79篇 |
2021年 | 200篇 |
2020年 | 123篇 |
2019年 | 174篇 |
2018年 | 181篇 |
2017年 | 139篇 |
2016年 | 159篇 |
2015年 | 200篇 |
2014年 | 285篇 |
2013年 | 360篇 |
2012年 | 497篇 |
2011年 | 494篇 |
2010年 | 280篇 |
2009年 | 252篇 |
2008年 | 438篇 |
2007年 | 401篇 |
2006年 | 366篇 |
2005年 | 395篇 |
2004年 | 304篇 |
2003年 | 302篇 |
2002年 | 302篇 |
2001年 | 220篇 |
2000年 | 212篇 |
1999年 | 206篇 |
1998年 | 83篇 |
1997年 | 71篇 |
1996年 | 63篇 |
1995年 | 68篇 |
1994年 | 61篇 |
1992年 | 138篇 |
1991年 | 124篇 |
1990年 | 157篇 |
1989年 | 105篇 |
1988年 | 113篇 |
1987年 | 118篇 |
1986年 | 98篇 |
1985年 | 110篇 |
1984年 | 85篇 |
1983年 | 69篇 |
1982年 | 62篇 |
1979年 | 82篇 |
1978年 | 66篇 |
1976年 | 47篇 |
1975年 | 54篇 |
1974年 | 48篇 |
1973年 | 63篇 |
1972年 | 56篇 |
1971年 | 47篇 |
1969年 | 54篇 |
排序方式: 共有9148条查询结果,搜索用时 218 毫秒
991.
992.
993.
994.
995.
996.
997.
998.
999.
Objective
To identify factors associated with initiation of the human papillomavirus vaccine series and parental report of a healthcare provider recommendation of the human papillomavirus vaccine in adolescent females.Design
Cross-sectional analysis of 2007 National Survey of Children's Health.Participants
Parents of 12–17 year-old US adolescent females.Main outcome measures
Associations of sociodemographic and healthcare factors with initiation of the human papillomavirus vaccine series and parental report of a healthcare provider recommendation of the human papillomavirus vaccine.Results
Data were analyzed for 16,139 adolescent females. Almost 20% of adolescent females initiated the HPV vaccine series. Significantly higher proportions of adolescent females who initiated the human papillomavirus vaccine series vs. those who did not initiate the human papillomavirus vaccine series had a parental report of their healthcare provider recommending the human papillomavirus vaccine (84% vs. 20%). In multivariable analyses, adolescent females who were American Indian/Alaska Native, were multiracial, received the meningococcal vaccine, received the tetanus/tetanus–diphtheria/tetanus–diphtheria–acellular pertussis vaccine, or were poor had higher adjusted odds of initiating the human papillomavirus vaccine series; parental report of a healthcare provider recommendation of the human papillomavirus vaccine was associated with about 18 times the adjusted odds of initiating the human papillomavirus vaccine series. In separate multivariable analyses, adolescent females who were African-American and uninsured had lower adjusted odds of a parental report of a healthcare provider recommendation of the human papillomavirus vaccine.Conclusion
Parental report of a healthcare provider recommendation is significantly associated with human papillomavirus vaccine-series initiation. African-American race/ethnicity and uninsurance were associated with lower odds of a parental report of a healthcare provider recommendation of the human papillomavirus vaccine. Routine healthcare provider recommendation of human papillomavirus vaccination might improve adolescent females’ human papillomavirus vaccination rates. 相似文献1000.
We used cross-sectional data to investigate whether current, past and never smokers report different levels of social interaction and whether the level of social interaction varied according to the type of interaction being measured. Self-reported questionnaire data were obtained from 239,043 men and women aged 45 years or older living in Australia between February 2006 and February 2010. The study participation rate was 18%. Poisson regression models were used to estimate the percentage differences in the mean values of four social interaction outcomes according to smoking status after adjusting for age, place of residence, income, education, health insurance status, physical limitation, psychological distress and exposure to passive smoke: number of times 1) spent with friends/family, 2) spoken on the telephone, 3) attended social meetings in the past week, and 4) number of people outside of home that can be depended upon. 7.6% of males and 6.9% of females were current smokers, 43.6% of males and 28.6% of females were ex-smokers and 48.8% of males and 64.5% of females had never smoked. Compared to never smokers, current smokers reported significantly fewer social interactions in the past week and had fewer people outside the home that they could depend on. Men and women current smokers attended 24.0% (95% CI, 20.3, 27.5) and 31.1% (95% CI, 28.1, 34.1) fewer social group meetings on average than never smokers. Smokers exposed to passive smoke reported higher levels of social interaction than those not exposed. Past smokers reported levels of social interaction that were intermediate to those of current and never smokers and the more years they had abstained from smoking, the more social interaction they reported on average. Our data are in line with previous research showing that smokers are not only worse off economically, physically and mentally, but are also less likely to be socially connected. 相似文献