Figure 4.

Forest plot of the risk ratio (RR) of 30-day mortality in patients undergoing minimally invasive (MIAVR) versus conventional aortic valve replacement (CAVR). The estimate of the RR of each trial corresponds to the middle of the squares, and the horizontal line shows the 95% confidence interval (CI). On each line, the number of events as a fraction of the total number is shown for both treatment and control groups. For each subgroup, the sum of the statistics, along with the summary RR, is represented by the middle of the solid diamonds. A test of heterogeneity between the trials within a subgroup is given below the summary statistics. M-H, Mantel-Haenszel.