Figure 4.

Forest plot of the odds ratio (OR) of graft failure at mid-term follow-up beyond 3-years after using radial artery (RA) versus saphenous vein (SV) as a conduit during coronary artery bypass grafting. The estimate of the OR of each trial corresponds to the middle of the squares, and the horizontal line shows the 95% CI. On each line, the number of events as a fraction of the total number randomized is shown for both treatment groups. The sum of the statistics, along with the summary OR, 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