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Table 1 Baseline and perioperative characteristics of the two groups

From: Effects of intravenous iron monotherapy for patients with iron deficient anemia undergoing total knee arthroplasty

Variables Crude p-value PS Matching p-value
Group I (n = 45) Group C (N = 221) Group I (n = 45) Group C (n = 45)
Age (y) 67.71 ± 7.94 71.96 ± 6.19 < 0.001 67.71 ± 7.94 69.82 ± 5.38 0.143
Sex (F/M) 40 (88.9%)/5 (11.1%) 203 (91.9%)/18 (8.1%) 0.519 40 (88.9%)/5 (11.1%) 40 (88.9%)/5 (11.1%) 1.000
Body weight (kg) 57.10 ± 4.97 59.96 ± 7.35 0.013 57.10 ± 4.97 56.84 ± 6.71 0.838
Hypertension 30 (66.7%) 152 (68.8%) 0.781 30 (66.7%) 31 (68.9%) 0.822
Diabetes 13 (28.9%) 65 (29.4%) 0.944 13 (28.9%) 13 (28.9%) 1.000
Chronic kidney disease 7 (15.6%) 50 (22.6%) 0.292 7 (15.6%) 8 (17.8%) 0.777
Cerebrovascular disease 6 (13.3%) 29 (13.1%) 0.970 6 (13.3%) 6 (13.3%) 1.000
Cardiovascular disease 9 (20.0%) 56 (25.3%) 0.447 9 (20.0%) 10 (22.2%) 0.796
Thyroid disease 5 (11.1%) 21 (9.5%) 0.740 5 (11.1%) 5 (11.1%) 1.000
Antiplatelets 12 (26.7%) 834 (37.6%) 0.165 12 (26.7%) 15 (33.3%) 0.490
Anticoagulants 1 (2.2%) 7 (3.2%) 0.735 1 (2.2%) 1 (2.2%) 1.000
Baseline hemoglobin (g/dL) 11.41 ± 1.12 11.46 ± 1.01 0.750 11.41 ± 1.12 11.40 ± 0.93 0.951
Preoperative platelet counts (× 109/L) 267.56 ± 72.33 249.21 ± 60.88 0.076 267.56 ± 72.33 253.29 ± 59.81 0.311
Estimateld blood loss (mL) 519.90 ± 145.55 514.25 ± 199.52 0.825 519.90 ± 145.55 531.54 ± 183.87 0.740
Postoperative drainage (mL) 317.40 ± 157.59 285.86 ± 135.82 0.169 317.40 ± 157.59 288.86 ± 137.05 0.352