Comparison Between Impact Factors and Citations in Evidence-Based Practice Guidelines
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To the Editor: Impact factors of medical journals are calculated as the total number of current citations of articles published in a journal during the previous 2 calendar years divided by the total number of designated articles published in that journal during the same period.1 Thus, impact factors indicate the annual average number of citations of articles that have appeared in a given journal.
Impact factors are widely regarded as a quality ranking for scientific journals. Concerns have arisen, however, that scientific communities might be overly reliant on impact factors to assess the worth of scientific publications, as these numbers may be artifically inflated in a number of ways.2-4 A related problem is that entire scientific disciplines tend to be evaluated based on average impact factors of their collective journals.5 Despite these concerns, researchers who have published in journals with high impact factors may be more likely to be rewarded . . . [Full Text of this Article] Methods
Takeo Nakayama, MD, PhD
Department of Medical System Informatics
Tsuguya Fukui, MD, PhD
Department of General Medicine and Clinical Epidemiology
Shunichi Fukuhara, MD, DMsc
Department of Healthcare Research
Kyoto University Graduate School of Medicine
Kyoto, Japan
Kiichiro Tsutani, MD, PhD
Department of Pharmacoeconomics
Graduate School of Pharmaceutical Sciences
The University of Tokyo
Tokyo, Japan
Shigeaki Yamazaki, PhD
Department of Library and Information Science
Aichi Shukutoku University
Aichi, Japan
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES
Life and times of the impact factor: retrospective analysis of trends for seven medical journals (1994-2005) and their Editors' views
Chew et al.
JRSM 2007;100:142-150.
ABSTRACT
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