| B. Surgical patients | |||
| Outcome measure | Preimplementation (n=8673) | Postimplementation (n=9109) | P values |
| n (%) | n (%) | ||
| High INR | 451 (5.2) | 219 (2.4) | <0.001 |
| Low INR* | 6349 (73.2) | 3972 (69.3) | <0.001 |
| Bleeding | 1170 (13.5) | 1011 (11.1) | <0.001 |
| DVT | 20 (0.2) | 8 (0.1) | 0.016 |
| PE | 16 (0.2) | 8 (0.1) | 0.079 |
| Stroke | 23 (0.3) | 26 (0.3) | 0.797 |
| MI | 49 (0.6) | 42 (0.5) | 0.332 |
| Any thrombosis | 105 (1.2) | 80 (0.9) | 0.029 |
| Hold warfarin | 1925 (22.2) | 1148 (12.6) | <0.001 |
| Missing INR on any day | 6071 (70.0) | 3680 (40.4) | <0.001 |
↵*Denominator based on those having 3 or more days of warfarin management.
DVT, deep vein thrombosis; INR, international normalised ratio; MI, myocardial infarction; PE, pulmonary embolism.