Table 2.
ASCOD Atherosclerosis Grade by Prior Aspirin
| Number (%) of Patients | ||||
|---|---|---|---|---|
| ASCOD atherosclerosis grade | Prior aspirin (n=4232) | Prior aspirin ‘Chronic treatment’ (n=1731) | Prior aspirin ‘Acute treatment’ (n=2501) | No prior aspirin (n=8967) |
| A0 | 1581 (37.4) | 547 (31.6) | 1034 (41.3) | 3374 (37.6) |
| A1 | 384 (9.1) | 152 (8.8) | 232 (9.3) | 736 (8.2) |
| A2 | 635 (15.0) | 302 (17.4) | 333 (13.3) | 1326 (14.8) |
| A3 | 780 (18.4) | 382 (22.1) | 398 (15.9) | 1116 (12.4) |
| A9 | 822 (19.4) | 333 (19.2) | 489 (19.6) | 2372 (26.5) |
| Missing | 30 (0.7) | 15 (0.9) | 15 (0.6) | 43 (0.5) |
A0, no atherosclerotic disease; A1 (likely causal), ≥50% ipsilateral stenosis of extracranial or intracranial arteries or a mobile thrombus in the aortic arch; A2 (causal relationship possible but uncertain), <50% stenosis of extracranial or intracranial artery or an aortic arch plaque of >4 mm in thickness without mobile thrombus; A3 (unlikely causal), plaque without stenosis or a stenosis in an artery contralateral to the cerebral infarct or a concomitant coronary or peripheral arterial disease; A9, insufficient information to grade atherosclerosis (no assessment of either intracranial arteries or extracranial arteries).11