Table 2. Multivariate risk factor analysis of the mortality of elderly patients with end-stage renal disease in the early dialysis group compared to the late dialysis group using Cox regression models and a propensity score matched model.

	Hazard ratio	95% confidence interval	P value
Model 1a	1.70	1.26–2.89	<0.001
Model 2b	1.37	1.00–1.27	0.049
Model 3c	1.30	0.89–1.89	0.176
Model 4d	1.46	0.98–2.20	0.064

^aUnadjusted

^bAdjusted for age, sex, and Charlson comorbidity index

^cAdjusted for age, sex, Charlson comorbidity index, hemoglobin, albumin, calcium, and phosphorus

^dPropensity score matched; covariates for matching: age, sex, Charlson comorbidity index, hemoglobin, albumin, calcium, and phosphorus