系统评价员选择中文生物医学期刊数据库的策略研究

目的通过比较中文生物医学期刊数据库收录文献、期刊、检索限定方式、文献导出、英文检索方式等内容,为国内外系统评价员合理选择中文生物医学期刊数据库提供参考依据。方法选择CBM、CNKI、VIP和万方数字化期刊全文数据库进行研究。收集各数据库收录文献数、期刊数、检索限定方式、文献导出及英语检索情况,数据收集截至2010年4月。根据期刊收录数据,统计出收录期刊回溯至创刊号的数量（回溯率）、收录了每年出版的每期期刊数（收全率）及各数据库收录期刊的交叉情况。结果各数据库平均收录期刊约1200种、收录文献约492万篇,平均回溯率及收全率分别为29%、48%。CBM收录文献数略少于CNKI（5673316vs5834952）,但收录期刊最多（1784种,占各数据库所有收录期刊的91%）,可采用主题词及自由词检索,每次可导出500条检索结果,并可对文献类型、出版年等多字段进行限定,总体上优于其他3个数据库。CNKI和万方均提供了英文界面,且CNKI能自动转换中英文检索词进行检索。结论 CBM数据库是系统评价员首选的中文生物医学期刊数据库,CNKI可作为非汉语为母语检索者的首选数据库。

Chinese Biomedical Databases: Selection and Search for Trials to Conduct Systematic Reviews

Objective To help systematic reviewers select the best Chinese biomedical databases to retrieve relevant trials in Chinese according to comparison of coverage,search feature,English search capabilities,and so on.Methods Four Chinese biomedical databases（CBM,CNKI,VIP and WANFANG） were selected.Data about coverage,search features,records downloading,and presence or lack of English search capabilities were found through their websites.The deadline for data collection was at the end of April 2010.Based on the data collected,the number of journals back to the inaugural issue and indexed cover-to-cover were calculated.Results The average of the indexed journals in 4 databases was about 1 200;the indexed articles were about 4.92 million,and the averages of backdate rate and entire collection rate were 29% and 48%,respectively.CBM indexed fewer articles than CNKI（5 673 316 vs.5 834 952）,but indexed the most journals（1784,91%）.It provides MeSH searching and more terms than other databases,and has an output of the tagged texts up to 500 records perfile.CNKI and WANFANG provide English interfaces,which is convenient for English searching,and CNKI has a function of ＂Cross-Language Search＂,which automatically translates English into Chinese.Conclusion CBM is the preferred database for systematic reviewers to retrieve relevant studies in Chinese,while CNKI is recommended for non-Chinese-speaking researchers due to its English interface and ＂Cross-Language Search＂ function.