Table 4.
Incidence of perioperative red blood cell transfusion
| Patients transfused at least one unit of red cells, n (%) | ||||
|---|---|---|---|---|
| All patients | Non-anemic | Anemic | ||
| sTfR | ID | 12 (22%) | 4 (13%) | 8 (35%) |
| IR | 30 (15%) | 22 (13%) | 8 (33%) | |
| Relative risk (CI) for transfusion with ID | 1.4NS (0.8, 2.6) | 1.0NS (0.4, 2.6) | 1.0NS (0.5, 2.3) | |
| Ferritin | ID | 24 (16%) | 14 (12%) | 10 (28%) |
| IR | 18 (18%) | 12 (13%) | 6 (55%) | |
| Relative risk (CI) for transfusion with ID | 0.9NS (0.5,1.6) | 0.9NS (0.5,1.9) | 0.5NS (0.2,1.1) | |
The relative risks and 95% confidence intervals (CI) for transfusion are given in the entire cohort as well as according to the presence of absence of anemia, using the two definitions of ID. Where the CI for the relative risk includes 1 the difference is marked as NS (non-significant)