Day of TIA/minor stroke | < 7 days | 7 days – 30 days | 30 days – 6 months | 6 months – 1 year | |
---|---|---|---|---|---|
Risk of stroke without aspirin | 0 | 10 | 15 | 20 | 25 |
Risk of stroke with aspirin | 0 | 8 | 12 | 16 | 20 |
Number prevented in period | 0 | 2 | 1 | 1 | 1 |
Cumulative number prevented | 0 | 2 | 3 | 4 | 5 |
Answer the following questions about risk of stroke. In 100 stroke patients:
What is the risk of stroke in the first year on aspirin?
1 in 5
What is the risk of stroke in the first year without aspirin?
25%
How many patients who would otherwise have had a stroke avoid a stroke because of the aspirin in the first year?
5
What is the relative risk reduction associated with aspirin treatment over the first year?
20%
How many patients need to be treated for the first week to prevent a stroke?
50
During which time period will aspirin have greatest benefits in terms of strokes prevented per day of taking aspirin?
7 days
Page last reviewed: 08 May 2020