Transfusion rates by preoperative HCT level, period and site
| Period | HCT >38% or unknown† | HCT 35.1%–38% | HCT ≤35% | ||||
| 2011–13 | 2014–16 | 2011–13 | 2014–16 | 2011–13 | 2014–16 | ||
| All sites | n | 8370 | 7634 | 1823 | 1517 | 2075 | 2021 |
| Transfused % | 2.5% | 1.4%*** | 6.3% | 3.9%** | 22.6% | 18.0%*** | |
| Hospital A | n | 2438 | 2144 | 464 | 402 | 677 | 594 |
| Transfused % | 2.8% | 1.6%** | 6.7% | 4.0% | 24.8% | 18.7%** | |
| Hospital B | n | 2937 | 3071 | 717 | 580 | 796 | 791 |
| Transfused % | 3.3% | 1.3%*** | 8.1% | 3.8%** | 24.9% | 16.1%*** | |
| Hospital C | n | 2995 | 2419 | 642 | 535 | 602 | 636 |
| Transfused % | 1.4% | 1.4% | 3.9% | 4.3% | 17.1% | 19.2% | |
**p<0.01; ***p<0.001 (change in period 2 was significant).
†13% of operations had unrecorded HCT with a disproportionate number of elective outpatient operations. These were classified as low transfusion risk, HCT >38%.
HCT, hematocrit.