Figure 3. Adjusted Hazard Ratios of Long-term Repeated Revascularization for Multiple Arterial Grafting (MAG) vs Left Internal Thoracic Artery Supplemented by Saphenous Vein Grafts (LITA+SVG) in Subgroups.

Adjusted hazard ratios were estimated from univariable Cox regression models that incorporated weights that were obtained from propensity score (PS) weighting for each subgroup of the overall study cohort. P values were calculated based on the Wald χ² test for an interaction term included in a multivariable Cox regression model using the overall study cohort, adjusting for significant baseline covariates with a P value of <.1 that was retained in backward elimination. BMI indicates body mass index (calculated as weight in kilograms divided by height in meters squared); COPD, chronic obstructive pulmonary disease; EF, ejection fraction; PVD, peripheral vascular disease; Renal disease, dialysis, acute, or chronic renal failure, or estimated glomerular filtration rate of less than 60 mL/min/1.73 m².