Abstract
Objectives: To describe the number of trials and participants in a typical systematic review from The Cochrane Database of Systematic Reviews. Methods: The number of trials in 1,000 Cochrane systematic reviews in issue 1, 2001 of The Cochrane Database of Systematic Reviews was counted for three categories of trial: included trials, ongoing trials, and trials awaiting assessment for inclusion. (The term trialis used in this paper, although a small number of Cochrane reviews include studies that are not trials.) The total number of participants in included trials was extracted from a sample of reviews. Results: A total of 9,778 trials were included in the Cochrane reviews. There were a further 356 ongoing trials and 1,138 trials awaiting assessment for inclusion. A typical review contained six included trials. Forty percent of the reviews listed ongoing trials and/or trials awaiting assessment for inclusion. Based on a sample of 258 reviews, the median number of participants per review was 945 (interquartile range, 313 to 2,511) per review and 118 (interquartile range, 60 to 241) per trial. Conclusion: This report is a descriptive study of the number of trials and participants in a typical Cochrane review from The Cochrane Library, issue 1, 2001.
Original language | English |
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Pages (from-to) | 820-823 |
Number of pages | 4 |
Journal | International Journal of Technology Assessment in Health Care |
Volume | 18 |
Issue number | 4 |
DOIs | |
Publication status | Published - 01 Jan 2002 |
Externally published | Yes |
Keywords
- Cochrane Collaboration
- Meta-analysis
- Randomized trial
- Systematic review
ASJC Scopus subject areas
- Health Policy