Duke Treadmill score The Duke Treadmill score uses three exercise parameters: Duke prognostic treadmill score = Exercise time (minutes based on the Bruce protocol) - (5 x maximum ST segment deviation in mm) - (4 x exercise angina (0 = none, 1 = nonlimiting, and 2 = exercise limiting)) Patients are classified as low, moderate, or high risk according to the score: Low-risk – score ≥+5 Moderate-risk – score from -10 to +4 High-risk – score <-11