From: Risk of upper gastrointestinal bleeding and perforation associated with low-dose aspirin as plain and enteric-coated formulations
All cases
Controls
Adjusted RR*
(N=2,105)
(N=11,500)
(95%CI)
Formulation/dose as instructed
Plain
≤ 150 mg
201
626
1.9 (1.6-2.2)
300 + mg
30
69
2.6 (1.6-4.2)
Enteric-coated
24
39
3.5 (2.0-6.1)
32
103
1.8 (1.2-2.8)