This shows how a surgical group compares with the average performance of all participating groups, based on four key measures of heart bypass surgical excellence:

• patient survival.
• absence of major complications
• recommended medications
• optimal surgical technique

This shows how a surgical group compares with the average performance of all participating groups, based on four key measures of heart bypass surgical excellence:

• patient survival.
• absence of major complications
• recommended medications
• optimal surgical technique

This is based on the chance that a patient will survive at least 30 days after the surgery and will be discharged from the hospital, adjusted for the overall health of the surgical group's patients.

This is based on the chance that a patient will not experience any of these five serious complications of heart bypass surgery during their hospitalization, adjusted for the overall health of the surgical group's patients: extended breathing support on a ventilator, an infection in the breastbone incision, kidney failure, a stroke, or a repeat operation for postoperative bleeding or other causes.

This is based on the chance that a patient will get all of the following drugs: a beta-blocker before surgery, and aspirin, a beta-blocker, and a statin or other drug to lower cholesterol afterward.

This is based on the chance that a patient will receive at least one graft involving an internal mammary artery, a technique shown to improve long-term survival.