Fig. 1: Comparison of relative risk estimates for specific harms of medical interventions from randomized and nonrandomized studies. Error bars represent 95% confidence intervals. (A random-effects summary estimate of the relative risk is provided for topics for which 2 or more nonrandomized studies were available. The risk estimates for the individual nonrandomized studies appear in a detailed version of this figure [see online Appendix 2, available at www.cmaj.ca/cgi/content/full/cmaj.050873/DC1].) *The topic numbers correspond to those in Table 1, which contains details about the nonrandomized studies.