From: Aspirin use and risk of breast cancer in African American women
Aspirin use |  | Triple negative (n = 284) | ||||
---|---|---|---|---|---|---|
Person-years | Cases | HRa | 95% CI | HRb | 95% CI | |
Non-use | 674,961 | 178 | 1.00 | Reference | 1.00 | Reference |
Past use | 143,603 | 61 | 0.98 | 0.72, 1.32 | 0.99 | 0.72, 1.35 |
Current use | 149,804 | 45 | 0.66 | 0.47, 0.94 | 0.70 | 0.49, 0.99 |
Duration of current use | ||||||
 Current, < 5 years | 36,817 | 14 | 0.48 | 0.28, 0.84 | 0.50 | 0.29, 0.87 |
 Current, 5–10 years | 20,923 | 18 | 0.92 | 0.56, 1.51 | 0.98 | 0.59, 1.61 |
 Current, ≥ 10 years | 17,183 | 13 | 0.70 | 0.39, 1.27 | 0.75 | 0.41, 1.37 |