Table 3. Results of the Test of the PH Assumption .

Variable	Chi-square	df	P Value
Age	0.12	1	.730
Gender (ref: female)	0.17	1	.680
Diabetic	0.66	1	.420
WIS	0.72	1	.401
CHD	0.69	1	.401
CLD	2.64	1	.101
CKD	0.01	1	.980
Cancer	2.21	1	.140
Global test	6.75	1	.560

Abbreviations: PH, proportional hazard; WIS, weak immune system; CHD, coronary heart disease; CLD, chronic lung disease; CKD, chronic kidney disease; df, degrees of freedom.

A two-sided P <.050 was considered statistically significant.