| Procedures performed in the past with N ≥ 19 |
| Step 1 |
Calculate median estimated blood loss (EBL)
(Absent data regarded as not being larger than median) |
| Step 2 |
Select minimal EBL threshold
Smallest median EBL where the lower 95% confidence limit for erythrocyte transfusion was >5%
Formula: 1-BETAINV(1-0,05,n-m+1,m) |
| Step 3 |
If median EBL→threshold à calculate 95% confidence limit for m. |
| Conclusion |
If value step 3→5% à no TS indicated |
| EBL= estimated blood loss, N= sample size, m= transfusion incidence |