Table 6 Comparison of hemoglobin levels, postoperative variables, and outcomes between groups (patients with preoperative anemia)

Blood drainage amount, mL

906.4 ± 394.5

777.8 ± 370.6

0.111

Transfusion, n (%)

41 (97.6%)

41 (82%)

0.019

Use of tranexamic acid, n (%)

33 (78.6%)

44 (88%)

0.265

Preoperative Hb, g/dL

11.3 ± 0.8

11.1 ± 0.8

0.125

Postoperative Hb, g/dL

 First TKA POD-5

9.2 ± 0.9

8.3 ± 0.8

 < 0.001

 Second TKA POD-5

9.1 ± 0.8

8.6 ± 0.7

0.005

 Second TKA POW-6

10.8 ± 0.6

11.0 ± 0.9

0.313

 Change in Hb level (preoperative – POW-6), g/dL

0.6 ± 0.9

0.1 ± 1.1

0.016

Infection rate, n (%)

2 (4.8%)

0 (0%)

0.206