Among patients with acute myocardial infarction, a large analysis has found that four variables appear to be significantly associated with greater adherence in at least four of six treatment adherence measures. These variables include:

Treatment in a hospital with full interventional capabilities.
Calendar year.

Age, female sex, congestive heart failure, chronic renal insufficiency, atrial fibrillation, and chronic dialysis were associated with worse adherence.

Abstract: American Journal of Medicine, January 2013.