1. ¹Division of Nephrology, University of Western Ontario, London, Ontario, Canada
2. ²Department of Epidemiology and Biostatistics, University of Western Ontario, London, Canada
3. ³Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Canada

Correspondence: AX Garg, London Health Sciences Centre, London Kidney Clinical Research Unit, Room ELL-101, Westminster Tower, 800 Commissioners Road East, London, Ontario, Canada N6A 4G5. E-mail: amit.garg@lhsc.on.ca

Received 26 June 2006; Revised 17 August 2006; Accepted 22 August 2006; Published online 11 October 2006.

Abstract

Physicians often scan a select number of journals to keep up to date with practice evidence for patients with kidney conditions. This raises the question of where relevant studies are published. We performed a bibliometric analysis using 195 renal systematic reviews. Each review used a comprehensive method to identify all primary studies for a focused clinical question relevant to patient care. We compiled all the primary studies included in these reviews, and considered where each study was published. Of the 2779 studies, 1351 (49%) were published in the top 20 journals. Predictably, this list included Transplantation Proceedings (5.9% of studies), Kidney International (5.3%), American Journal of Kidney Diseases (4.7%), Nephrology Dialysis Transplantation (4.3%), Transplantation (4.2%), and Journal of the American Society of Nephrology (2.4%). Ten non-renal journals were also on this list, including New England Journal of Medicine (2.4%), Lancet (2.3%), and Diabetes Care (2.2%). The remaining 1428 (51%) studies were published across other 446 journals. When the disciplines of all journals were considered, 59 were classified as renal or transplant journals (42% of articles). Other specialties included general and internal medicine (16%), endocrinology (diabetes) and metabolism (6.5%), surgery (6.2%), cardiovascular diseases (6.1%), pediatrics (4.3%), and radiology (3.3%). About half of all renal practice evidence is published in non-renal journals. Browsing the top journals is important. However, relevant studies are also scattered across a large range of journals that may not be routinely scanned by busy physicians, and keeping up with this literature requires other continuing education strategies.