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Mean number of drugs and potential interactions among warfarin users.
| Number of potential interactions | Number of patients | number of drugs Mean (SD) |
|---|---|---|
| 0 | 2713 | 3.6(1.3) |
| 1 | 2114 | 4.7(1.6) |
| 2 | 1229 | 5.6(1.7) |
| 3 | 604 | 6.4(1.8) |
| 4 | 283 | 7.1(1.7) |
| 5 | 144 | 7.8(2.0) |
| 6 | 50 | 8.4(2.0) |
| 7 | 22 | 9.1(2.0) |
| 8 | 8 | 10.0(2.7) |
| 9 | 3 | 12.7(3.1) |
| 10 | 4 | 11.3(1.5) |
| 13 | 1 | 14.0(0.0) |
