Figure 3.

Forest plot summarizing the effect of cardiac rehabilitation utilization interventions on enrollment. Note: Boxes represent the risk ratio (RR) for individual trials. The boxes are proportional to the weight of each study in the analysis and the lines represent their 95% confidence interval (CI). The diamond represents the pooled RR, and its width represents its 95% CI. M-H: Mantel Haenszel method. Tau² represents the variance of the effect size across studies. Chi² (Cochran Q test) represents the weighted sum of squared differences between individual studies and the pooled effect across studies. I² statistic represents the percentage of variation across studies that is due to heterogeneity. Z represents the test for overall effect across all studies. df: degrees of freedom.