Relative Citation Impact of Various Study Designs in the Health Sciences

Grading quality of evidence and strength of recommendations

2004 • 7,653 citations

Randomized, Controlled Trials, Observational Studies, and the Hierarchy of Research Designs

2000 • 3,409 citations

A Comparison of Observational Studies and Randomized, Controlled Trials

2000 • 2,320 citations

A new system for grading recommendations in evidence based guidelines

2001 • 1,575 citations

A Comparison of Results of Meta-analyses of Randomized Control Trials and Recommendations of Clinical Experts

1992 • 1,451 citations

Comparison of Evidence of Treatment Effects in Randomized and Nonrandomized Studies

2001 • 881 citations

The Medical Review Article: State of the Science

1987 • 859 citations

Systems to rate the strength of scientific evidence.

2002 • 798 citations

When are observational studies as credible as randomised trials?

2004 • 518 citations

Fortnightly Review: How can impact factors be improved?

1996 • 493 citations

Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?

2004 • 429 citations

Meta-analysis/Shmeta-analysis

1994 • 350 citations

Meta-analysis: Statistical alchemy for the 21st century

1995 • 333 citations

The level of non-citation of articles within a journal as a measure of quality: a comparison to the impact factor

2004 • 160 citations

The Medical Review Article Revisited: Has the Science Improved?

1999 • 150 citations

Discussion Sections in Reports of Controlled Trials Published in General Medical Journals

2002 • 116 citations

Systematic reviews: a cross-sectional study of location and citation counts

2003 • 99 citations

Doubling the Impact

2004 • 63 citations

Does anybody read "evidence-based" articles?

2003 • 27 citations

Observational epidemiology is the preferred means of evaluating effects of behavioral and lifestyle modification

1997 • 17 citations