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Table 3 Descriptive statistics for iron variables comparing the iron transfusion group versus the non-iron transfusion group. TKA total knee arthroplasty

From: Efficacy and cost-effectiveness of universal pre-operative iron studies in total hip and 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*
  1. *Chi-square test P value