CKB and myocardial infarction: However, there were fewer myocardial infarction and major coronary events (n = 922) in the present study, and larger numbers of these events in CKB would be required to rule out relative risk reductions smaller than about 20% (odds ratio for MCE 0.96; 95% CI 0.79–1.18) to draw a definitive conclusion on these outcomes.