Table 2.

Hazard ratios for mortality according to receipt of chronic dialysis during follow up

Variables	Number of deaths	Exposure time, patient-years	Crude hazard ratio (95% CI)	P value	Adjusted hazard ratio a (95% CI)	P value
Not receiving chronic dialysis	1,699	13,071	(Referent)		(Referent)
Receiving chronic dialysisb	4,108	15,326	1.35 (1.26 to 1.44)	<0.001	1.39 (1.30 to 1.49)	<0.001

^aAdjusted for all covariates listed in Table 1. ^bChronic dialysis was calculated as a discrete time-dependent covariate. CI, confidence interval.