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Table 1 Baseline characteristics of 18,242 hemodialysis patients stratified by baseline body mass index

From: The association of dialysis adequacy, body mass index, and mortality among hemodialysis patients

Variables Body mass index, kg/m2
Total <  20 20 to < 23 ≥23 P value
N (%) 18,242 5681 (31) 6973 (38) 5588 (31)  
Age, years 59 ± 14 58 ± 16 59 ± 14 59 ± 13 0.383
Male, % 59 52 63 61 < 0.001
Vintage, year 1.5 (0.5–4.1) 1.9 (0.5–5.2) 1.5 (0.5–4.2) 1.2 (0.4–3.3) < 0.001
ESRD reason, %
 Diabetes 43 37 43 49 < 0.001
 Hypertension 19 18 19 20 0.031
 Glomerulonephritis 12 15 12 10 < 0.001
 Others 26 30 26 21 < 0.001
Comorbidities, %
 Diabetes 43 37 43 49 < 0.001
 Hypertension 30 30 30 29 0.088
 Cardiovascular disease 8 8 8 8 0.359
Single pool Kt/V 1.4 ± 0.3 1.5 ± 0.4 1.4 ± 0.3 1.4 ± 0.3 < 0.001
Urea reduction ratio, % 69 (64–74) 72 (67–76) 69 (64–74) 67 (63–72) < 0.001
Treatment time, min 239 ± 11 238 ± 12 239 ± 10 239 ± 11 < 0.001
Predialysis SBP, mmHg 146 ± 20 145 ± 20 146 ± 20 145 ± 19 0.236
Predialysis DBP, mmHg 81 ± 11 82 ± 11 81 ± 11 81 ± 11 < 0.001
Presence of RKF, % 6 5 6 7 < 0.001
Hemoglobin, g/dL 10.1 ± 1.3 9.9 ± 1.3 10.1 ± 1.2 10.2 ± 1.2 < 0.001
nPCR, g/kg/day 1.0 ± 0.8 0.9 ± 0.7 1.0 ± 0.8 1.0 ± 0.8 < 0.001
  1. Values for categorical variables are shown as percentages; values for continuous variables, as mean ± standard deviation or median (interquartile range)
  2. Abbreviations: DBP diastolic blood pressure, ESRD end-stage renal disease, nPCR normalized protein catabolic rate, RKF residual kidney function, SBP systolic blood pressure