Table 1.
Characteristics of the study population.
| Variables | Severance hospital (n = 26,746) | Myongji hospital (n = 36,894) |
|---|---|---|
| Total dialysis time, mean (SD), h | 3.97 (0.18) | 3.87 (0.30) |
| Arterial pressure, mean (SD), mmHg | −124.91 (29.66) | −139.11 (30.51) |
| Venous pressure, mean (SD), mmHg | 118.25 (27.93) | 123.34 (30.52) |
| Blood flow rate, mean (SD), mL/min | 266.74 (30.86) | 252.98 (25.17) |
| Average blood flow rate, mean (SD), mL/min | 267.47 (30.92) | 253.99 (24.56) |
| Dialysate flow rate, mean (SD), mL/min | 573.90 (91.45) | 552.64 (116.23) |
| Total ultrafiltration volume, mean (SD), mL | 2,287.36 (825.48) | 2,427.10 (880.45) |
| Ultrafiltration rate, mean (SD), mL/h | 597.79 (215.32) | 649.37 (228.27) |
| Average ultrafiltration rate, mean (SD), mL/h | 597.94 (222.08) | 653.12 (241.62) |
| Dialysate temperature, mean (SD), °C | 36.05 (0.32) | 36.21 (0.35) |
| Dialysate sodium level, mean (SD), mmol/L | 139.20 (1.43) | 140.35 (1.03) |
| Pre-dialytic SBP, mean (SD), mmHg | 137.53 (21.84) | 137.89 (17.77) |
| Pre-dialytic DBP, mean (SD), mmHg | 64.61 (13.22) | 65.80 (11.10) |
| Pre-dialytic MAP, mean (SD), mmHg | 88.92 (13.79) | 89.83 (11.27) |
| Pulse rate, mean (SD), beats per minute | 69.91 (10.84) | 71.62 (11.64) |
| Total number of segments | 101,655 | 243,059 |
SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure.