Background: The so-called 'reappraised literature' is steadily rising. Evidence-Base Journals (EBJ) are peer-reviewed publications as ACP Journal Club, Evidence-Based Medicine, Evidence-Based Nursing, and Evidence-Based Mental Health retrieve and appraise recent articles from prominent medical journals through rigorous criteria. 'Evidencia' is an Evidence-Base Journal published bi-monthly, that has been produced by a Family Medicine Foundation (Fundacion MF) at Argentina since 1998. As the others, this journal contains abstracts and commentaries of high-quality, methodologically sound original studies and systematic reviews.

Objectives: To determine the proportion of top yielding Journals and of systematic reviews abstracted in 'Evidencia' along time in context with EBJ.

Methods: We assessed the years 1998, 2000, 2002 and 2004. EBJ proportion was obtained from a Walker and Haynes paper [1]. Top Yielding Journals were: N England Journal of Medicine, JAMA, BMJ, Lancet and Cochrane Database Systematic Reviews.

Results: The proportion of systematic reviews abstracted has increased since 'Evidencia' began publication in 1998 when reviews comprised 17% of the abstract content (EBJ 30%). By 2004 the proportion of systematic reviews was 28% (EBJ 38%). Cochrane reviews have been prominent in this growing presence of reviews. Of these reviews, Cochranes are 0% (EBJ 24%) in 1998 and 43% (EBJ 31%) in 2004. Top Yielding Journals summarized 70% (EBJ 38%) in 1998 and 64% (EBJ 55%) in 2004.

Conclusions: Systematic reviews, especially Cochrane ones, have grown to constitute a substantial fraction of the evidence-based literature in 'Evidencia' as the other EBJ.

References: 1. Walker C, Haynes B. The growing prominence of Cochrane systematic reviews in evidence-based resources. http://www.cochrane.org/colloquia/abstracts/ottawa/O-021.htm