Table 4 Comparison of hemoglobin levels, postoperative variables, and outcomes between groups (all patients)

Blood drainage amount, mL

854.1 ± 432.5

850.5 ± 439.0

0.934

Transfusion, n (%)

191 (96.5%)

129 (58.6%)

 < 0.001

Use of tranexamic acid, n (%)

183 (92.4%)

204 (92.7%)

0.906

Preoperative Hb, g/dL

12.9 ± 1.2

12.9 ± 1.4

0.834

Postoperative Hb, g/dL

 First TKA POD-5

9.9 ± 1.2

9.3 ± 1.3

 < 0.001

 Second TKA POD-5

9.8 ± 1.3

9.1 ± 0.9

 < 0.001

 Second TKA POW-6

12.0 ± 1.0

11.9 ± 1.3

0.765

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

1.0 ± 0.9

1.0 ± 1.4

0.722

Infection rate, n (%)

2 (1%)

0 (0%)

0.224