Table 5.

Multivariate analysis and adjustment of the Cox proportional hazards model to the data

	Variables	P-value	Coefficient	Relative risk	95% CI Confidence interval
	Systemic arterial hypertension	0.025	10.87	52679.67	4.00	694469787.06
	Serum creatinine (mg/dL) at 1 year	0.066	3.62	37.32	0.78	1778.57
	Number of plasmapheresis sessionsa	0.702	0.16	1.17	0.52	2.65
	Treatment start timeb	0.058	1.15	3.15	0.96	10.36
Interactions	Number of plasmapheresis sessions, treatment start date	0.038	-1.27	0.28	0.09	0.93
	Systemic arterial hypertension, serum creatinine at 1 year	0.999	___	___	___	___
	Systemic arterial hypertension, number of plasmapheresis sessions	0.999	___	___	___	___
	Systemic arterial hypertension, treatment start time	0.999	___	___	___	___
	Serum creatinine at 1 year, number of plasmapheresis sessions	0.770	___	___	___	___
	Serum creatinine at 1 year, treatment start time	0.233	___	___	___	___
	Plasmapheresis	0.146	___	___	___	___
	Transplant time	0.392	___	___	___	___
	Partial remission	0.633	___	___	___	___
	Length of hospital stay (days)	0.831	___	___	___	___

a) For better interpretation of the results, in the calculations of this step, the variable values were divided by 10.

b) For better interpretation of the results, in the calculations of this step, the variable values were divided by 30.