Table 6 Effect of duration of treatment with aspirin on the risk of UGIB and perforation among current users as compared to non-use

Days of treatment

(consecutive prescriptions)

   1-60 (all users)

40

52

4.5 (2.9-7.1)

First-ever users

25

32

4.6 (2.7-8.1)

Distant users

15

20

4.2 (2.0-8.6)

   61-180

34

71

2.7 (1.7-4.2)

   181-730

96

286

1.9 (1.5-2.5)

   >730

117

428

1.6 (1.3-2.0)