Table 1.
Clinical baseline characteristics of the primary TKA patients
| Baseline characters | Total (n = 1444) | LHBL (n = 1208) | HHBL (n = 236) | p-value |
|---|---|---|---|---|
| Age (years) | 67.0 (63.0, 71.0) | 67.0 (63.0, 71.0) | 67.5 (63.0, 71.0) | 0.621a |
| Female (n, %) | 1097 (75.9) | 925 (76.6) | 172 (72.9) | 0.225b |
| BMI (kg/) | 27.1 (25.0 29.5) | 27.1 (25.0, 29.6) | 27.2 (24.8, 29.4) | 0.654a |
| Smoking (n, %) | 95 (6.6) | 79 (6.5) | 16 (6.8) | 0.892b |
| Alcohol drinking (n, %) | 98 (6.8) | 82 (6.8) | 16 (6.8) | 0.996b |
| Comorbidity history (n, %) | ||||
| Hypertension | 799 (0.55) | 661 (54.7) | 138 (58.5) | 0.288b |
| Diabetes | 269 (18.6) | 226 (18.7) | 43 (18.2) | 0.860b |
| Cerebral infarction | 89 (6.2) | 75 (6.2) | 14 (5.9) | 0.343b |
| CAD | 149 (10.3) | 113 (9.4) | 36 (15.3) | 0.006b* |
| Atrial fibrillation | 16 (1.1) | 13 (1.1) | 3 (1.3) | 0.736c |
| Renal disease | 25 (1.7) | 22 (1.8) | 3 (1.3) | 0.785c |
| Liver disease | 15 (1.0) | 12 (1.0) | 3 1.3) | 0.723c |
| Varicose Veins in the Legs | 113 (7.8) | 98 (8.1) | 15 (6.4) | 0.358b |
| Preoperative DVT | 51 (3.5) | 40 (3.3) | 10 (4.2) | 0.478b |
| Preoperative anticoagulant (n, %) | 178 (12.3) | 140 (11.6) | 38 (16.1) | 0.054b |
| Preoperative EPO (n, %) | 186 (19.8) | 264 (21.9) | 22 (9.3) | < 0.001b |
LHBL low hidden blood loss group, HHBL high hidden blood loss group, BMI body mass index, CAD coronary artery disease, DVT deep venous thrombosis, EPO erythropoietin
aMann-Whitney U-test
bPearson’s chi-square test
cFisher’s exact test