Forest plot of long-term survival.

<p>The 95% confidence interval (CI) for the hazard ratio for each study is represented by a horizontal line and the point estimate is represented by a square. The size of the square corresponds to the weight of the study in the meta-analysis. Pooled treatment effect is shown as a diamond that spans the 95% CI. Data for a fix-effects model are shown as there was low statistical heterogeneity (I² = 31%). df = degrees of freedom; IV = Inverse Variance; I² = percentage of the total variation across studies due to heterogeneity; Z = test of overall treatment effect.