Risk of myocardial infarction and beta2GPI plasma levels. (A) Risk of myocardial infarction with increasing quartile of beta2GPI antigen, VWF levels, and the ratio of beta2-GPI/VWF. (B) Risk of myocardial infarction with increasing quartile of beta2GPI antigen, for men younger than and older than 60 years. Error bars represent 95% confidence interval.