Variable | Standard CPH model | Cox model with continuous time varying effects (Model A) | Cox model with piecewise time varying effects (Modified model B) | |||||||||
| Hazard Ratio | 95% Confidence Interval |
| Hazard Ratio | 95% Confidence Interval |
| Hazard Ratio | 95% Confidence Interval | ||||
Race-black | 0.6001 | 1.816 | 1.261 | 2.615 | 0.5168 | 1.677 | 1.162 | 2.420 | 0.5179 | 1.678 | 1.163 | 2.423 |
Race-other | −0.4758 | 0.622 | 0.336 | 1.152 | −0.6768 | 0.508 | 0.272 | 0.950 | -0.6728 | 0.510 | 0.273 | 0.954 |
Lymphnode-positive | 0.7231 | 2.059 | 1.463 | 2.898 | 0.7591 | 2.136 | 1.521 | 3.000 | 0.7599 | 2.138 | 1.522 | 3.004 |
Lymphnode-unknown | 0.7998 | 2.218 | 1.504 | 3.271 | 0.8205 | 2.272 | 1.525 | 3.384 | 0.8195 | 2.269 | 1.523 | 3.381 |
Stage II | 0.5933 | 1.808 | 1.248 | 2.620 | 0.2789 | 1.322 | 0.895 | 1.951 | 0.2783 | 1.321 | 0.894 | 1.951 |
Stage III | 0.8522 | 2.339 | 1.481 | 3.692 | 0.5741 | 1.776 | 1.099 | 2.870 | 0.5710 | 1.770 | 1.095 | 2.862 |
Stage IV | 1.8908 | 6.575 | 3.709 | 11.654 | 1.8176 | 6.157 | 3.354 | 11.303 | 1.8209 | 6.177 | 3.363 | 11.348 |
Tumor size | 0.0069 | 1.007 | 1.002 | 1.012 |
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FPsize |
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| 0.6205 | 1.860 | 1.489 | 2.324 | 0.6176 | 1.854 | 1.484 | 2.317 |
Age | 0.0381 | 1.039 | 1.029 | 1.048 |
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FPage |
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| 0.0424 | 1.043 | 1.025 | 1.062 | 0.0422 | 1.043 | 1.024 | 1.062 |
FPage × time |
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| 0.0039 | 1.004 | 1.001 | 1.007 | 0.0038 | 1.004 | 1.001 | 1.007 |
PRA-positive | 0.4303 | 1.534 | 1.211 | 1.943 |
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| 0.0543 | 1.056 | 0.763 | 1.461 |
PRA × |
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| 1.3726 | 3.946 | 2.336 | 6.666 |
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PRA × |
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| 1.3152 | 3.725 | 2.034 | 6.824 |
PRA × |
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| 0.7182 | 2.051 | 1.292 | 3.254 |