Table 3.

P values for the significance test of covariates.

Covariates	GAM	Partial logistic	Proportional hazard	Piecewise exponential
Transplant status (x 2)	0.0107	<0.0001	0.0076	0.0081
Age (x 3)	0.011	0.0135	0.0190	0.0199
Previous surgery (x 5)	0.0575	0.0672	0.0830	0.0867