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Estimated values of β1 and the p-values for goodness-of-fit tests for a model without and with taking Z2 into account.
| Model | β1 | PH assumption | Linearity | Overall |
|---|---|---|---|---|
| Cox | ||||
| Z1 only | 0.44 | <0.01 | 0.14 | <0.01 |
| Z1 and Z2 | 0.93 | 0.42 | 0.81 | 0.36 |
| Add | ||||
| Z1 only | 2.22 | 0.34 | <0.01 | <0.01 |
| Z1 and Z2 | 1.03 | 0.91 | 0.67 | 0.86 |
