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Table 2 Treatment characteristics of patients

From: Drug-drug interactions and risk of bleeding among inpatients on warfarin therapy: a prospective observational study

Characteristic Frequency Percent
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
  1. ^Dose at the time of screening for drug interaction and bleeding.