Target-vessel revascularization was per- formed more often in the PCI group at 1 year (OR: 4.36), 2 years (OR: 4.20), and 3 years (OR: 3.30). Additional analyses using Bayesian methods, initiated by the Task Force, have affirmed the equivalence of PCI and CABG for improving survival in patients with unprotected left main CAD who are candidates for either strategy.12 A Bayesian cross-design and network meta-analysis was applied to 12 studies (4 RCTs and 8 observational studies) comparing CABG with PCI (n=4574 patients) and to 7 stud- ies (2 RCTs and 5 observational studies) comparing CABG with medical therapy (n=3224 patients). The ORs of death at 1 year after PCI compared with CABG did not differ among RCTs (OR: 0.99; 95% Bayesian credible interval 0.67 to 1.43), matched cohort studies (OR: 1.10; 95% Bayesian cred- ible interval 0.76 to 1.73), and other types of cohort stud- ies (OR: 0.93; 95% Bayesian credible interval 0.58 to 1.35). A network meta-analysis suggested that medical therapy is associated with higher risk of death at 1 year than is the use of PCI for patients with unprotected left main CAD (OR: In that study, the Bayesian method generated a credible interval that has a high probability of containing the true OR. In other words, the true value for the OR has a 95% probability of lying within the interval of 0.68 to 1.45. Because the value 1 is included in the credible interval, which is also symmetri- cal, the results show no evidence of a difference between PCI and CABG for 1-year mortality rate. The possibility that PCI is associated with increased or decreased 1-year mortality over CABG is small (<2.5% for a possible 45% increase or for a 32% decrease, according to the definition of the 95% Bayesian credible interval). 5.12. 