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Table 1 Baseline characteristics of the study population

From: Associations between the erythropoiesis-stimulating agent resistance index and the geriatric nutritional risk index of maintenance hemodialysis patients and increased mortality

  All patients (n = 298) ERI quartiles P value
Q1 (n = 74) Q2 (n = 75) Q3 (n = 75) Q4 (n = 74)
Age, years 66.0 ± 13.1 61.7 ± 13.0 65.3 ± 11.8 66.8 ± 14.1 70.2 ± 12.2 0.0010
Male, % 187 (62.8 %) 54 (73.0 %) 49 (65.3 %) 47 (62.7 %) 37 (50.0 %) 0.0340
Diabetes, % 144 (48.3 %) 39 (52.7 %) 38 (50.7 %) 34 (45.3 %) 33 (44.6 %) 0.7023
Cardiovascular disease, % 78 (26.2 %) 22 (29.7 %) 21 (28.0 %) 18 (24.0 %) 17 (23.0 %) 0.7555
Dialysis vintage, years 3.3 (1.2–6.7) 2.8 (1.1–5.6) 3.5 (1.1–8.1) 3.6 (1.1–7.6) 3.5 (1.3–6.8) 0.6318
Kt/V 1.4 ± 0.2 1.4 ± 0.2 1.4 ± 0.3 1.4 ± 0.2 1.4 ± 0.3 0.5231
Systolic BP, mmHg 153.1 ± 17.2 154.6 ± 17.6 149.4 ± 17.6 155.5 ± 17.2 153.0 ± 16.2 0.1354
Diastolic BP, mmHg 79.8 ± 11.5 82.6 ± 11.8 77.9 ± 11.1 80.6 ± 12.2 78.0 ± 10.4 0.0357
Pulse pleasure, mmHg 73.3 ± 13.1 72.0 ± 13.1 71.5 ± 13.2 74.9 ± 12.4 75.0 ± 13.5 0.2061
Body mass index, kg/m2 22.0 ± 3.5 23.0 ± 3.2 22.5 ± 3.7 21.8 ± 3.6 20.6 ± 2.9 0.0002
Albumin, g/dl 3.7 ± 0.3 3.7 ± 0.3 3.7 ± 0.3 3.6 ± 0.3 3.6 ± 0.4 0.2525
nPCR, g/kg/dl 0.8 ± 0.2 0.8 ± 0.2 0.9 ± 0.2 0.8 ± 0.2 0.8 ± 0.2 0.7969
CRP, mg/dl 0.8 ± 0.0 0.3 ± 0.7 0.3 ± 0.6 0.4 ± 0.8 0.5 ± 0.9 0.4315
Hemoglobin, g/dl 10.9 ± 1.0 11.1 ± 0.8 11.2 ± 0.8 10.7 ± 1.0 10.4 ± 1.1 <0.0001
Total cholesterol, mg/dl 150.6 ± 30.4 150.9 ± 29.7 151.7 ± 32.9 152.2 ± 32.9 147.6 ± 25.9 0.7929
Calcium (corrected), mg/dl 9.1 ± 0.6 9.1 ± 0.6 9.1 ± 0.6 9.2 ± 0.6 9.1 ± 0.5 0.2019
Phosphorus, mg/dl 4.9 ± 1.6 5.0 ± 1.4 5.4 ± 1.7 4.4 ± 1.6 4.7 ± 1.6 0.0014
Intact-PTH, pg/ml 94 (54–168) 109 (67–179) 102 (47–156) 75 (49–151) 110 (46–183) 0.2870
GNRI 96.3 ± 8.7 99.0 ± 8.1 97.6 ± 9.2 95.4 ± 8.6 93.3 ± 8.0 0.0003
Ferritin, ng/ml 63 (24–125) 56 (25–133) 65 (21–125) 44 (21–108) 72 (41–144) 0.0893
TSAT, % 21.6 ± 10.3 24.7 ± 9.5 22.5 ± 10.7 21.0 ± 10.2 18.3 ± 10.0 0.0016
ERI, IU/kg/week/Hb 8.2 (5.0–13.1) 3.6 (2.7–4.1) 6.2 (5.4–7.0) 10.7 (9.3–11.7) 17.5 (14.8–20.7) <0.0001
  1. Continuous values are expressed as means ± SD. Count data are expressed as percentages
  2. Abbreviations: BP blood pressure, nPCR normalized protein catabolic rate, CRP C-reactive protein, PTH parathyroid hormone, TSAT transferrin saturation, ERI erythropoiesis resistance index