Univariate analysis of the effect of previous external beam radiation on mortality in patients treated with CABG
| Variable | HR (95% CI) | P value |
| Age (per 10 years) | 0.86 (0.54 to 1.38) | 0.535 |
| Gender (male) | 0.87 (0.26 to 2.98) | 0.826 |
| BMI (per 5 kg/m2) | 1.03 (0.68 to 1.55) | 0.901 |
| Diabetes | 0.87 (0.20 to 3.82) | 0.859 |
| Hyperlipidaemia | 0.48 (0.07 to 3.37) | 0.458 |
| Hypertension | 0.67 (0.18 to 2.49) | 0.555 |
| Congestive heart failure | 1.66 (0.45 to 6.12) | 0.449 |
| LVEF (per 10%) | 0.69 (0.43 to 1.11) | 0.123 |
| Prior MI | 0.72 (0.12 to 4.35) | 0.725 |
| Prior PCI | 0.65 (0.11 to 3.90) | 0.637 |
| Peripheral vascular disease | 1.35 (0.22 to 8.16) | 0.743 |
| Pre-CABG creatinine (mg/dL) | 0.23 (0.02 to 2.63) | 0.235 |
| Current/former smoker | 2.32 (0.68 to 7.89) | 0.179 |
| Chronic obstructive pulmonary disease | 2.64 (0.67 to 10.4) | 0.165 |
| Left main disease | 2.73 (0.74 to 10.1) | 0.131 |
| STS risk (per 5%) | 1.50 (0.88 to 2.56) | 0.139 |
| Harvest-skeletonised | 0.24 (0.01 to 5.05) | 0.361 |
BMI, body mass index; LVEF, left ventricular ejection fraction; MI, myocardial infarction; PCI, percutaneous coronary intervention;CABG, coronary artery bypass graft surgery; .