Number of different prescribed medications per patient (excluding warfarin) classified by type of use over the 12 months of the study; and absolute number of patients given any medication that is known to interact with warfarin.
| Number of patients taking at least one drug in each category that: | |||||
|---|---|---|---|---|---|
| Increased INR | Decreased INR | ||||
| Type of use | Median number of drugs taken by 214 patients (IQR; range) | Definitely | Possibly | Definitely | Possibly |
| Continuously taken | 3 (1–5; 0–12) | 54 | 54 | 14 | 0 |
| Started taking during the year | 0 (0–2; 0–10) | 24 | 13 | 4 | 0 |
| Taken intermittently | 1 (0–2; 0–8) | 30 | 49 | 1 | 0 |
| Stopped taking during the year | 0 (0–1; 0–6) | 10 | 10 | 1 | 1 |
IQR = interquartile range.