Table 1.

Probabilities of various events occurring after suspected myocardial infarction according to treatment received by a typical patient in the trials and according to whether myocardial infarction has occurred. Probabilities are expressed as percentages

Probability of outcome	Treatment
	Aspirin	Streptokinase	Tissue plasminogen activator
Given myocardial infarction:
Dying of myocardial infarction	11.5	11.5×0.75=8.6*	8.6×0.8=6.9*
Surviving cerebrovascular accident	0.2	0.5	0.7
Dying of cerebrovascular accident	0.2	0.5	0.7
Dying of haemorrhage or anaphylaxis	0	0.2	0.18
Surviving without stroke†	88.1	90.2	91.5
Given no myocardial infarction:
Dying of another cause	2.0	2.0	2.0
Surviving stroke	0	0.4	0.6
Dying of stroke	0	0.4	0.6
Dying of complications	0	0.08	0.06
Surviving without impairment†	98	97.1	96.7

^*Streptokinase reduces the risk of dying by 25 percentage points when compared with aspirin alone; tissue plasminogen activator may reduce the risk of dying by a further 20 percentage points.⁷ 

^†Calculated as 100 minus the sum of the four probabilities above.