Table 2. Longitudinal linear regression model of the laboratory and clinical parameters associated with the erythropoietin resistance index in hemodialysis patients.

Variables	Non-Adjusted				Adjusted
	β	95%CI		P-value	β	95%CI		P-value
Age (years)	−0.062	−0.088	−0.037	<0.001	−0.137	−0.174	−0.099	<0.001
Arterial hypertension, (yes vs no)	2.449	1.254	3.645	<0.001	−1.216	−3.377	0.954	0.270
Kt/V index, %	0.700	−0.260	1.660	0.153	11.61	−0.009	23.238	0.050
Urea reduction ratio, %	−0.089	−0.133	−0.045	<0.001	−0.380	−0.075	−0.004	0.047
Interdialytic weight gain, g	0.301	0.119	0.483	0.001	0.528	0.212	0.844	0.001
Body mass index, kg/m2	−0.390	−0.479	−0.302	<0.001	−0.211	−0.359	−0.624	0.005
ARB use (yes vs no)	3.919	3.102	4.737	<0.001	2.068	0.472	3.663	0.011
Serum iron, µg/dL	−0.092	−0.110	−0.074	<0.001	−0.094	−0.127	0.061	<0.001
Ferritin, µg/L	0.0007	−0.0005	0.002	0.164	0.001	0.0002	0.003	0.025
Serum albumin, µg/L	−6.990	−8.118	−5.862	<0.001	−1.816	−3.258	−0.375	0.013
Ultra-sensitive CRP, µg/L	0.238	0.083	0.393	0.003	0.119	0.057	0.181	<0.001

Kt/V: quality of dialysis; ARB: angiotensin receptor blocker; CRP: C-reactive protein; CI: confidence interval; ARB: angiotensin receptor blocker antihypertensive.