Table 5. Adapting a parsimonious model: tests for the equality of covariates across transitions and for omitting covariates.

Model	Log-likelihood	AIC	df	LR-test a	p
PH model	-2640	5301	11
B	-2640	5298	9	B vs. A	0.657
C	-2640	5297	8	C vs. B	0.506
D	-2641	5295	7	D vs. C	0.517
E	-2641	5295	6	E vs. D	0.158
				E vs. A	0.594

^aLikelihood-ratio test