Table 3.
Event Rate and Odds Ratio at Each Level of IMPROVE Risk Score
| Score | VTE | No VTE | Event Rate | OR (95% CI) |
|---|---|---|---|---|
| n=135 | n=19 082 | |||
| 0 | 5 | 3917 | 0.13 | Reference |
| 1 | 27 | 5662 | 0.47 | 3.74 (1.44 to 9.71) |
| 2 | 23 | 3368 | 0.68 | 5.35 (2.03 to 14.09) |
| 3 | 41 | 3598 | 1.13 | 8.93 (3.52 to 22.62) |
| 4 | 12 | 1393 | 0.85 | 6.75 (2.37 to 19.19) |
| 5 | 11 | 596 | 1.81 | 14.46 (5.01 to 41.76) |
| 6 | 11 | 369 | 2.89 | 23.35 (8.07 to 67.58) |
| 7 | 4 | 140 | 2.78 | 22.38 (5.95 to 84.25) |
| ≥8 | 1 | 39 | 2.5 | 20.09 (2.2933 to 175.94) |
IMPROVE indicates International Medical Prevention Registry on Venous Thromboembolism; OR, odds ratio; VTE, venous thromboembolism.