Table 1 Demographic and Clinical characteristics of the two study groups before and after propensity score matching
| Â | Entire sample | Propensity-matched group | ||||
|---|---|---|---|---|---|---|
Preoperative characteristics | ANH | p-value | ANH | p-value | ||
Yes (n = 358) | No (n = 931) |  | Yes (n = 354) | No (n = 354) |  | |
Age [median (SD); yr] | 50 ± 12 | 51 ± 13 | 0.139 | 50 ± 12 | 50 ± 13 | 0.866 |
Male/female, no.(%) | 224/134 (62.6%) | 394/537 (42.3%) | <0.001 | 220/134 (62.1%) | 222/132 (62.7%) | 0.877 |
Height [median (SD); cm] | 164 ± 7 | 162 ± 7 | <0.001 | 164 ± 7 | 164 ± 7 | 0.761 |
Weight [mean (SD); kg] | 63 ± 10 | 60 ± 10 | <0.001 | 63 ± 10 | 62 ± 10 | 0.580 |
Estimated blood volume [mean (SD); mL] | 4298 ± 779 | 4045 ± 722 | <0.001 | 4285 ± 765 | 4258 ± 750 | 0.636 |
ASA, no. (%) | Â | Â | 0.070 | Â | Â | 0.230 |
 I | 1 (0.3%) | 4 (0.4) |  | 1 (0.3%) | 3 (0.8%) |  |
 II | 79 (22.1%) | 206 (22.1%) |  | 79 (22.3%) | 77 (21.8%) |  |
 III | 248 (69.3%) | 678 (72.8%) |  | 244 (68.9%) | 256 (72.3%) |  |
 IV | 30 (8.4%) | 43 (46%) |  | 30 (8.5%) | 18 (5.1%) |  |
NYHA class III/IV, no.(%) | 83 (23.2%) | 233 (25%) | 0.491 | 81 (22.9%) | 75 (21.2%) | 0.586 |
History of smoking, no. (%) | 108 (30.2%) | 204 (21.9%) | 0.002 | 108 (30.5%) | 100 (28.2%) | 0.509 |
Coexistent disease | ||||||
 AF, no. (%) | 81 (22.6%) | 222 (23.8%) | 0.644 | 80 (22.6%) | 82 (23.2%) | 0.858 |
 Hypertension, no. (%) | 75 (20.9%) | 209 (22.4%) | 0.561 | 74 (20.9%) | 79 (22.3%) | 0.648 |
 Diabetes, no. (%) | 17 (4.7%) | 63 (6.8%) | 0.179 | 17 (4.8%) | 18 (5.1%) | 0.862 |
 HLP, no. (%) | 5 (1.4%) | 6 (0.6%) | 0.191 | 5 (1.4%) | 2 (0.6%) | 0.451 |
 Cerebrovascular disease, no. (%) | 16 (4.5) | 37 (4.0) | 0.688 | 16 (4.5) | 16 (4.5) | 1.000 |
Preoperative Medication | ||||||
 ACEI and ARB, no. (%) | 28 (7.8%) | 77 (8.3%) | 0.792 | 28 (7.9%) | 29 (8.2%) | 0.890 |
 β-blockers, no. (%) | 19 (5.3%) | 66 (7.1%) | 0.248 | 19 (5.4%) | 22 (6.2%) | 0.629 |
 Calcium Channel Blockers, no. (%) | 25 (7.0%) | 71 (7.6%) | 0.694 | 24 (6.8%) | 19 (5.4%) | 0.431 |
 Diuretics, no. (%) | 16 (4.5%) | 70 (7.5%) | 0.049 | 16 (4.5%) | 13 (3.7%) | 0.569 |
Preoperative laboratory examination | ||||||
 T-ch [median (SD); mmol/L] | 4.5 ± 1.0 | 4.4 ± 1.1 | 0.178 | 4.5 ± 1.0 | 4.4 ± 1.1 | 0.305 |
 Cr [median (SD); umol/L] | 70 ± 15 | 67 ± 16 | <0.001 | 70 ± 15 | 70 ± 17 | 0.976 |
 ALB [median (SD); g/L] | 42 ± 4 | 42 ± 4 | 0.182 | 42 ± 4 | 42 ± 4 | 0.535 |
 HCT [median (SD); %] | 42 ± 5 | 40 ± 4 | <0.001 | 42 ± 4 | 42 ± 4 | 0.918 |
 Propensity score [median (SD)] | 0.33 ± 0.12 | 0.26 ± 0.11 | <0.001 | 0.32 ± 0.12 | 0.32 ± 0.11 | 0.840 |