TABLE II.
Cox Proportional Hazard Analysis
| Analysis of Maximum Likelihood Estimates
| |||||
|---|---|---|---|---|---|
| Name of Effecta | Estimated Effect | Standard Error of Estimate | Chi-Square Test of Significance | Pr > ChiSq | Hazard Ratio |
| Transplant | 0.77891 | 0.43443 | 3.2146 | 0.0365 | 2.179 |
| Months Symptoms Appearb | −0.02860 | 0.01056 | 7.3315 | 0.0068 | 0.972 |
a
Effect of transplantation measures the effect on survival in transplant versus matched non-transplant patients. It is the estimate of a parameter in the Cox proportional hazard model from which the hazard ratio relative risk is calculated.
b
Effect of “months symptoms appear” measures the effect of a one month difference in age at onset of symptoms between two patients who are similar in other regards. Its estimate in turn estimates the parameter in the Cox model that is related to the effect of age at onset on survival. The Hazard ratio for the effect of age at onset is calculated from this estimate.