Fig. 2. Predicted probability of death after perioperative myocardial infarction in respect to history of congestive hearth failure and coronary artery bypass graft surgery (the number of red blood cell units administered was held constant at 1.8). Patients with perioperative myocardial infarction and previous coronary artery bypass grafting have lower probabilities of death in each category (P = 0.04). CABG = coronary artery bypass graft; CHF = congestive heart failure.