Rerun liver transplant analysis (Example 21) adding the variable SURGERY. Did it make a difference in the transplant variable? Example 21 Results: The PHREG Procedure Basis Details for Spline Effect sage Column Power Break Knot 1 1 2 3 26.650239562 Summary of the Number of Event and Censored Values Total Event Censored Percent Censored 103 75 28 27.18 Convergence Status Convergence criterion (GCONV=1E-8) satisfied. Model Fit Statistics Criterion Without Covariates With Covariates -2 LOG L 596.651 589.069 AIC 596.651 595.069 SBC 596.651 602.021 Testing Global Null Hypothesis: BETA=0 Test Chi-Square DF Pr > ChiSq Likelihood Ratio 7.5822 3 0.0555 Score 8.5984 3 0.0351 Wald 8.4021 3 0.0384 Type 3 Tests Effect DF Wald Chi-Square Pr > ChiSq trans 1 0.0551 0.8144 sage 2 8.3024 0.0157 Analysis of Maximum Likelihood Estimates Parameter DF Parameter Estimate Standard Error Chi-Square Pr > ChiSq Hazard Ratio 95% Hazard Ratio Confidence Limits Label trans 1 -0.07219 0.30751 0.0551 0.8144 0.930 0.509 1.700 sage 1 1 -0.00415 0.02475 0.0281 0.8669 . . . sage 1 sage 2 1 0.00125 0.0007728 2.6252 0.1052 . . . sage 2 The SAS System Obs chisq pval 1 2.373 0.12345 The PHREG Procedure Model Information Data Set WORK.JASA2 Dependent Variable