IRR for vessel stenosis in SWiTCH subjects with either low or uninterpretable TCD velocities compared with normal TCD velocities
| Vasculopathy region . | TCD result . | IRR (95% CI) . | P value . |
|---|---|---|---|
| ACA | Low | 1.2 (1.0, 1.5) | .073 |
| Uninterpretable | 1.3 (1.1, 1.6) | .004 | |
| DICA | Low | 1.9 (1.2, 3.1) | .006 |
| Uninterpretable | 1.9 (1.4, 2.5) | <.0001 | |
| MCA | Low | 5.1 (3.1, 8.3) | <.0001 |
| Uninterpretable | 4.1 (2.7, 6.4) | <.0001 | |
| PCA | Low | 2.8 (1.1, 6.9) | .031 |
| Uninterpretable | 1.8 (0.7, 4.6) | .227 |
| Vasculopathy region . | TCD result . | IRR (95% CI) . | P value . |
|---|---|---|---|
| ACA | Low | 1.2 (1.0, 1.5) | .073 |
| Uninterpretable | 1.3 (1.1, 1.6) | .004 | |
| DICA | Low | 1.9 (1.2, 3.1) | .006 |
| Uninterpretable | 1.9 (1.4, 2.5) | <.0001 | |
| MCA | Low | 5.1 (3.1, 8.3) | <.0001 |
| Uninterpretable | 4.1 (2.7, 6.4) | <.0001 | |
| PCA | Low | 2.8 (1.1, 6.9) | .031 |
| Uninterpretable | 1.8 (0.7, 4.6) | .227 |
Risk ratios were determined using a Poisson model controlling for age at index stroke, previous history of TIA, and hemisphere.