Table 2.
Estimated log hazard ratios for testing overall covariate effects and the test results of nonproportionality (nonprop) using Cox proportional hazards (PH) model and Gray piecewise constant time-varying coefficients (PC-TVC) model.
| Covariate | Cox PH | Gray PC-TVC | ||
|---|---|---|---|---|
| Log hazard ratio (95% CI) | P value | P value | Nonprop*P value | |
| Donor blood type | ||||
| A | −0.711 (−1.484, 0.062) | 0.071 | 0.163 | 0.498 |
| B | −0.343 (−1.534, 0.847) | 0.572 | 0.679 | 0.480 |
| AB | 0.482 (−1.208, 2.171) | 0.576 | 0.001 | 0.001 |
| Serum creatinine (mg/dL) | 1.635 (0.695, 2.575) | 0.001 | 0.001 | 0.527 |
| On ventilator | 0.828 (−0.166, 1.821) | 0.102 | 0.002 | 0.012 |
| Positive CMV | 0.686 (0.096, 1.275) | 0.023 | 0.017 | 0.163 |
| Female gender | −0.143 (−0.731, 0.445) | 0.633 | 0.045 | 0.007 |
*Null hypothesis: the proportional hazards (PH) assumption is not violated.