Shariff Salimah Z, Bejaimal Shayna Ad, Sontrop Jessica M, Iansavichus Arthur V, Haynes R Brian, Weir Matthew A, Garg Amit X
Kidney Clinical Research Unit, Division of Nephrology, Western University, London, ON, Canada.
J Med Internet Res. 2013 Aug 15;15(8):e164. doi: 10.2196/jmir.2624.
Physicians frequently search PubMed for information to guide patient care. More recently, Google Scholar has gained popularity as another freely accessible bibliographic database.
To compare the performance of searches in PubMed and Google Scholar.
We surveyed nephrologists (kidney specialists) and provided each with a unique clinical question derived from 100 renal therapy systematic reviews. Each physician provided the search terms they would type into a bibliographic database to locate evidence to answer the clinical question. We executed each of these searches in PubMed and Google Scholar and compared results for the first 40 records retrieved (equivalent to 2 default search pages in PubMed). We evaluated the recall (proportion of relevant articles found) and precision (ratio of relevant to nonrelevant articles) of the searches performed in PubMed and Google Scholar. Primary studies included in the systematic reviews served as the reference standard for relevant articles. We further documented whether relevant articles were available as free full-texts.
Compared with PubMed, the average search in Google Scholar retrieved twice as many relevant articles (PubMed: 11%; Google Scholar: 22%; P<.001). Precision was similar in both databases (PubMed: 6%; Google Scholar: 8%; P=.07). Google Scholar provided significantly greater access to free full-text publications (PubMed: 5%; Google Scholar: 14%; P<.001).
For quick clinical searches, Google Scholar returns twice as many relevant articles as PubMed and provides greater access to free full-text articles.
医生经常在PubMed上搜索信息以指导患者护理。最近，谷歌学术作为另一个可免费访问的文献数据库也越来越受欢迎。
比较在PubMed和谷歌学术中进行搜索的性能。
我们对肾病学家（肾脏专科医生）进行了调查，并为每位医生提供了一个从100项肾脏治疗系统评价中得出的独特临床问题。每位医生提供了他们会输入文献数据库以查找证据来回答临床问题的搜索词。我们在PubMed和谷歌学术中执行了每一项这些搜索，并比较了检索到的前40条记录的结果（相当于PubMed中的2个默认搜索页面）。我们评估了在PubMed和谷歌学术中进行的搜索的召回率（找到的相关文章的比例）和精确率（相关文章与不相关文章的比例）。系统评价中纳入的原始研究作为相关文章的参考标准。我们还记录了相关文章是否可作为免费全文获取。
与PubMed相比，谷歌学术中的平均搜索检索到的相关文章数量是其两倍（PubMed：11%；谷歌学术：22%；P<0.001）。两个数据库中的精确率相似（PubMed：6%；谷歌学术：8%；P=0.07）。谷歌学术提供免费全文出版物的获取机会显著更多（PubMed：5%；谷歌学术：14%；P<0.001）。
对于快速临床搜索，谷歌学术返回的相关文章数量是PubMed的两倍，并提供更多免费全文文章的获取机会。
