Table 4.
Two-level nested hierarchical Cox proportional hazards regression model of predictors for cardiac events after CABG
| Variable | Cardiac events |
|
|---|---|---|
| Hazards ratio (95% CI) | P value | |
| First layer—significant variables from univariate analysis | ||
| Diabetes mellitus | 1.123 (0.689-1.832) | .641 |
| LVEF (>50% vs 30%-50% vs <30%) | 1.930 (1.354-2.751) | <.001∗ |
| Left main disease | 0.790 (0.480-1.298) | .352 |
| History of PCI | 0.727 (0.346-1.524) | .398 |
| Second layer—lipid profile subcomponents (calculated separately) | ||
| LDL-C | 1.199 (0.835-1.723) | .325 |
| Non–HDL-C | 1.358 (0.987-1.867) | .060 |
| HDL-C | 0.563 (0.218-1.456) | .236 |
| TC/HDL-C ratio | 1.269 (0.997-1.615) | .053 |
| Triglycerides | 1.523 (1.131-2.053) | .006∗ |
CI, Confidence interval; LVEF, left ventricular ejection fraction; PCI, percutaneous coronary intervention; LDL-C, low-density lipoprotein cholesterol; non–HDL-C, non–high-density lipoprotein cholesterol; HDL-C, high-density lipoprotein cholesterol; TC, total cholesterol.
∗
P ≤ .01, statistically significant.