Figure 3.

Forest plot of the weighted mean difference (WMD) in cross-clamp duration between minimally invasive (MIAVR) and conventional aortic valve replacement (CAVR). The estimate of the WMD of each trial corresponds to the middle of the squares, and the horizontal line shows the 95% confidence interval (CI). On each line, the mean and standard deviation (SD) of cross-clamp durations in individual studies is shown for both treatment and control groups. For each subgroup, the sum of the statistics, along with the summary WMD, 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. IV, inverse variance.