Table 5 Transfusion frequency in patients with different pre-operative hemoglobin levels and predicted number needed to treat (NNT) to prevent red blood cell transfusion by an iron infusion-induced increase of the preoperative hemoglobin of 1 g/dL.
Hemoglobin (g/dL) | All Patients, n = 305 | Patients not receiving tranexamic acid, n = 187 | Patients receiving a drainage, n = 133 | Patients not receiving tranexamic acid, but a drainage, n = 95 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
n | % | NNT | n | % | NNT | n | % | NNT | n | % | NNT | |
9.0–10.0 | 2/2 | 100.0 | 1.5 | 1/1 | 100.0 | 2.0 | 2/2 | 100.0 | 2.0 | 1/1 | 100.0 | 2.0 |
10.0–11.0 | 1/3 | 33.3 | 4.3 | 1/2 | 50.0 | 3.0 | 1/2 | 50.0 | 4.0 | 1/2 | 50.0 | 6.0 |
11.0–12.0 | 2/20 | 10.0 | 22.7 | 2/12 | 16.7 | 11.9 | 1/4 | 25.0 | 9.3 | 1/3 | 33.3 | 6.0 |
12.0–13.0 | 4/71 | 5.6 | 17.9 | 4/48 | 8.3 | 12.0 | 4/28 | 14.3 | 7.0 | 4/24 | 16.7 | 6.0 |
13.0–14.0 | 0/68 | 0.0 | n.a. | 0/35 | 0.0 | n.a. | 0/32 | 0.0 | n.a. | 0/19 | 0.0 | n.a. |
14.0–15.0 | 1/86 | 1.2 | 86.0 | 1/54 | 1.9 | 54.0 | 1/40 | 2.5 | 40.0 | 1/29 | 3.4 | 29.0 |
> 15.0 | 0/55 | 0.0 | n.a. | 0/35 | 0.0 | n.a. | 0/25 | 0.0 | n.a. | 0/17 | 0.0 | n.a. |
