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   85篇
  免费   24篇
儿科学   7篇
基础医学   1篇
内科学   7篇
神经病学   2篇
外科学   8篇
综合类   2篇
预防医学   82篇
  2022年   1篇
  2018年   3篇
  2015年   1篇
  2014年   1篇
  2013年   5篇
  2012年   7篇
  2011年   3篇
  2010年   5篇
  2009年   4篇
  2008年   5篇
  2007年   3篇
  2006年   3篇
  2005年   4篇
  2004年   4篇
  2003年   5篇
  2002年   2篇
  2001年   3篇
  2000年   3篇
  1999年   3篇
  1997年   1篇
  1996年   2篇
  1992年   3篇
  1990年   3篇
  1989年   2篇
  1988年   2篇
  1987年   3篇
  1986年   2篇
  1984年   2篇
  1983年   2篇
  1982年   2篇
  1979年   1篇
  1974年   1篇
  1973年   3篇
  1972年   1篇
  1970年   5篇
  1968年   2篇
  1967年   1篇
  1966年   1篇
  1965年   1篇
  1963年   1篇
  1961年   1篇
  1959年   1篇
  1957年   1篇
排序方式: 共有109条查询结果,搜索用时 15 毫秒
41.
42.
OBJECTIVE: Young skiers are at increased risk for injury, however, epidemiological data on skiing related fatal injuries among child skiers are scarce. This study aimed to provide information needed to develop injury control and prevention programs. DESIGN AND SETTING: Study subjects came from Colorado, USA and were identified using a death certificate based surveillance system. Fatal injuries were limited to events that occurred at established commercial ski resorts in Colorado, and subjects were classified as child skiers (0-17 years) or adult skiers (> or =18 years). MAIN OUTCOME MEASURE: Type and external cause, time, and week day of injury, gender and residency of the decedents. RESULTS: During the study period from 1980-2001, 149 fatal injuries associated with downhill skiing were identified; 21 (14.1%) occurred among child skiers aged < or =17 years. The age of the youngest decedent was 7 years. In females the proportion of fatal injuries among child skiers was nearly three times that of adults. Traumatic brain injuries were the leading cause of death (67% of all deaths) among children, while multiple internal injuries and traumatic brain injuries accounted for almost equal proportions of fatal injuries among adults. Collision was the leading external mechanism of fatal injuries, accounting for more than two thirds of fatal injuries in both child and adult skiers. CONCLUSIONS: Traumatic brain injury was the leading cause and collision was the leading external injury mechanism of fatal injuries associated with downhill skiing among child skiers. This underscores the importance of brain injury prevention strategies, including the use of ski helmets and prevention of collisions on ski slopes.  相似文献   
43.
44.
BACKGROUND: This study examined cigarette smoking among a sample of medical college students in Wuhan, People's Republic of China. Specific cultural factors associated with cigarette smoking in China were discussed and issues which need to be studied in the future are presented. METHODS: A self-administrated questionnaire was administered to a sample of 1,611 medical students in 1995. Smoking status was based on self-reported use of cigarettes within the preceding 180 days. Information about demographic characteristics, home residence, annual family income, and smoking status of family members was also obtained. RESULTS: A total of 1,540 (1,201 males and 339 females) completed and returned the questionnaires (response rate 95.6%). None of the 339 female students surveyed reported cigarette smoking. A total of 37.7% (95% confidence interval (CI) = 35.0-40.5%) of the male medical students were current smokers, and 5. 3% (95% CI = 4.0-6.6%) were former smokers. The mean age of beginning to smoke was 16.5 years (95% CI = 8.7-24.3 years). The major reasons for first smoking were stress (42.8%, 95% CI = 38.2-47. 4%), curiosity (34.4%, 95% CI = 29.6-38.4%), and loneliness (33.7%, 95% CI = 28.7-37.4%). Multivariate analyses suggested that age, college year, and having a family member who smoked were significantly associated with cigarette smoking. CONCLUSIONS: The results indicated a need to provide comprehensive tobacco use prevention programs among medical students.  相似文献   
45.
46.
正A case-control study was conducted to investigate associations between organophosphate pesticide(OP)exposure,aggression,impulsivity,and attempted suicide.Questionnaires were used to collect information;impulsivity and aggression were measured by the Barratt Impulsivity Scale(BIS)and the Aggression Inventory(AI).A greater number of OP symptoms was associated with an  相似文献   
47.
48.
Abstract

Unguarded agricultural power take-off (PTO) drivelines and related components, including secondary drivelines powered by the PTO, have been historically recognized as serious farm-related hazards that can cause severe, permanently disabling injuries and death when entanglement occurs. The lack of longitudinal and causative data on these incidents has been a barrier for developing relevant and effective intervention strategies. A study was conducted at Purdue University to design, develop, and test a system to document, code, store, and analyze a large amount of agriculture driveline-related injury and fatality data to allow for identification of causative factors and trends that could be used in developing engineering, educational, and regulatory solutions. This was accomplished by first developing a standardized injury reporting form and coding system and then developing an electronic database, using Microsoft® Access 2002,® which could be used to document, store, query, and analyze agricultural driveline-related incident data. Incidents resulting in injury or fatality identified between 1970 and 2003 were documented and the available data coded and entered into the database using a systematic approach. A pilot-test of the usability of the database was conducted on data collected from 92 incidents involving children and adolescents. Using the validated data management system, an analysis was conducted on data collected from 674 cases entered into the database. Findings from the analysis of the data included the following: the frequency of documented agricultural driveline-related incidents increased from the 1970s to the 1980s, but then decreased through the 1990s and into the 2000s; the 11 to 15-year-old age group had the highest frequency of cases; incidents occurred more often in the fall season; and augers, elevators, or conveyors were the type of implements most frequently involved. Recommendations were made to reduce the risk of agriculture driveline injuries and for future research.  相似文献   
49.
Primary objective: The purpose of this study was to assess the relationship between sex and traumatic brain injury (TBI) mortality.

Methods and procedures: A total of 20 465 persons with TBI were identified from a Colorado population-based surveillance system for 1994-1998. Case fatality ratios were calculated to identify sex differences for selected risk factors. Unconditional logistic regression was used to determine the relationship between TBI mortality and sex controlling for risk factors.

Main outcomes and results: Adjusting for age, race, metropolitan residence and penetrating injury, the estimated odds of TBI mortality for males compared to females was 1.21 (95% CI 1.10, 1.34) for pre-hospital fatalities and 1.19 (95% CI 1.05, 1.37) for hospital fatalities.

Conclusion: Results indicate differences in TBI mortality comparing males and females. Future studies are warranted to identify if behaviour and physiological responses are associated with TBI outcomes among males and females.  相似文献   
50.
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