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 |