Table 2

Absolute risk, benefit, odds ratios (OR), and 95% confidence intervals (CI) for cardiovascular events, myocardial infarctions, strokes, and all cause mortality

	Absolute risk in control group (%/year)	Absolute benefit from aspirin (%/year)	OR	95% CI
Cardiovascular events
US⁴	0.67	0.11	0.82	0.71 to 0.96
UK10	1.34	−0.04	1.02	0.82 to 1.27
TPT⁵	1.71	0.41	0.74	0.57 to 0.97
HOT⁶	1.05	0.16	0.85	0.73 to 0.99
Weighted mean	0.92	0.13	0.85	0.78 to 0.94

Myocardial infarction
US⁴	0.44	0.18	0.56	0.48 to 0.71
UK10	0.93	0.03	0.96	0.73 to 1.25
TPT⁵	1.33	0.31	0.76	0.57 to 1.03
HOT⁶	0.36	0.13	0.65	0.49 to 0.85
Weighted mean	0.52	0.15	0.70	0.62 to 0.79

Strokes
US⁴	0.18	−0.04	1.22	0.93 to 1.59
UK10	0.41	−0.07	1.16	0.80 to 1.68
TPT⁵	0.32	0.10	0.69	0.38 to 1.26
HOT⁶	0.42	0.01	0.98	0.78 to 1.24
Weighted mean	0.29	−0.02	1.06	0.91 to 1.24

All cause mortality
US⁴	0.41	0.02	0.96	0.79 to 1.15
UK10	1.59	0.16	0.88	0.71 to 1.09
TPT⁵	1.31	−0.05	1.03	0.78 to 1.36
HOT⁶	0.86	0.06	0.93	0.79 to 1.09
Weighted mean	0.73	0.05	0.94	0.85 to 1.04