Table 9.

Proportionality assumption results for the loader and dump-trucks covariates based on the repair database

Covariate	P-value
	Lo	DT.1	DT.2	DT.3	DT.4	DT.5	DT.6
z1	0.965	0.812	0.556	0.991	0.919	0.947	0.858
z2	0.868	0.995	0.253	0.908	0.956	0.940	0.894
z3	0.865	0.944	0.781	0.984	0.755	0.842	0.982
z4	0.904	0.894	0.730	0.940	0.850	0.760	0.915
z5	0.376	0.677	0.914	0.735	0.909	0.428	0.777