|Class 0: No angina, even during strenuous or prolonged physical activity|
|Class 1: Angina only during strenuous or prolonged physical activity|
|Class 2: Slight limitation, with angina only during vigorous physical activity|
|Class 3: Symptoms during occasional living activities, i.e., mild limitation|
|Class 4: Symptoms during everyday living activities, i.e., moderate limitation|
|Class 5: Inability to perform any activity without angina or angina at rest, i.e., severe limitation|
↵⁎ Canadian Cardiovascular Society classification was modified.