Challenges in Using Nonrandomized Studies in Systematic Reviews of Treatment Interventions

Figure 2. Included are reports that examined 1 or more questions of clinical effectiveness (  = 49). Bars represent the number of reports that included the specific study design. Totals exceed 49 because each report can include more than 1 clinical question and more than 1 study design.
Figure 2. Included are reports that examined 1 or more questions of clinical effectiveness (  = 49). Bars represent the number of reports that included the specific study design. Totals exceed 49 because each report can include more than 1 clinical question and more than 1 study design. Study designs by type of clinical question for Evidence-based Practice Center reports.n

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  1. Ann Intern Med June 21, 2005 vol. 142 no. 12 Part 2 1112-1119
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