Table 2 Treatment characteristics of patients

Warfarin indication

Prevention and treatment of deep vein thrombosis

82

61.7

Pulmonary embolism

13

9.8

Atrial fibrillation ± Stroke

28

21

Myocardial infarction

6

4.5

Unspecified

4

3.0

Number of drugs per patient

<3

26

19.5

3-5

35

26.3

6-8

40

30.1

>8

32

24.1

Mean

6.0

Standard deviation

3.3

Duration on warfarin therapy

< 1 month

20

15.0

1-3 months

56

42.1

>3 months

57

42.9

Mean

2.2

Standard deviation

0.7

Warfarin dose^{^}

2.5 mg

25

18.8

5 mg

78

58.6

7.5 mg

22

16.7

10 mg

5

3.8

≥12.5 mg

3

2.3

No of interactions per patient

0

1

0.8

1

31

23.2

2-4

71

53.4

≥5

30

22.6

Total

133

100

Mean

3.2

Standard deviation

2.1