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Rate ratio of injurious motor vehicle crash associated with exposure to warfarin in the year before the index date
| Drug (timeperiod examined) | Cases(N = 5579) | Controls(N = 12 911) | Cruderate ratio | Adjustedrate ratio | 95% CI |
|---|---|---|---|---|---|
| Unexposed | 5532 | 12775 | Reference | Reference | Reference |
| Warfarin (1 year) | 47 | 136 | 0.80 | 0.74 | 0.55, 1.05 |
| 1–4 prescriptions | 26 | 55 | 1.09 | 1.07 | 0.67, 1.72 |
| 5+ prescriptions | 21 | 81 | 0.60 | 0.54 | 0.33, 0.88 |
