Table 3 Descriptive statistics for iron variables comparing the iron transfusion group versus the non-iron transfusion group. TKA total knee arthroplasty
Iron variable | All data (mean (SD)) N = 296 | Iron transfusion (mean (SD)) N = 38 | No iron infusion (mean (SD)) N = 258 | Independent T-test P value |
|---|---|---|---|---|
S iron (5–30 μmol/l) | 15.5 (5.1) | 11.9 (4.1) | 16.1 (5.0) | <0.0001 |
Transferrin (1.9–3.1g/l) | 2.5 (0.4) | 2.8 (0.4) | 2.5 (0.3) | 0.0013 |
TIBC (47–77 μmol/l) | 62.8 (8.9) | 69.0 (10.8) | 61.9 (8.2) | 0.0015 |
Tran satrn (20–45%) | 25.7 (10.7) | 18.1 (6.4) | 26.9 (10.7) | <0.0001 |
Ferritin (30–300 μg/l) | 176.1 (170.3) | 51.0 (30.4) | 196.0 (175.0) | <0.0001 |
Early Hb (g/dl) | 138.81 (11.63) | 130.29 (12.22) | 140.18 (10.95) | <0.0001 |
Late Hb (g/dl) | 138.35 (12.04) | 132.25 (13.01) | 139.22 (11.67) | 0.0011 |
Post-op Hb (g/dl) | 112.18 (13.38) | 105.41 (14.44) | 113.22 (12.93) | 0.0009 |
Intra-operative blood salvage rate | 47.6% | 45% | 52% | 0.4211* |