Duke Treadmill Score

Duke Treadmill Score (DTS) DTS = exercise time (min) − (5 × max ST deviation in mm) − (4 × angina index)
Angina index: 0 = none, 1 = non-limiting, 2 = exercise-limiting
Mark DB, Shaw L, Harrell FE Jr, et al. Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease. N Engl J Med. 1991;325(12):849-853.
2002 ACC/AHA Guidelines for Exercise Testing (updated 2013)

METs Calculation – Bruce Protocol Men: VO₂ (mL/kg/min) = 14.8 − (1.379 × T) + (0.451 × T²) − (0.012 × T³)
Women: VO₂ (mL/kg/min) = 4.38 × T − 3.9
METs = VO₂ / 3.5
T = total exercise time in decimal minutes
Foster C, Jackson AS, Pollock ML, et al. Generalized equations for predicting functional capacity from treadmill performance. Am Heart J. 1984;107(6):1229-1234.
Validated in ACSM’s Guidelines for Exercise Testing and Prescription (11th ed., 2021)

Predicted Functional Capacity (age- and sex-adjusted) Men: Predicted METs = 18 − (0.15 × age)
Women: Predicted METs = 14.7 − (0.13 × age)
% of predicted = (achieved METs / predicted METs) × 100
Kim ESH, et al. Prognostic value of functional capacity in patients with suspected or known coronary artery disease. J Am Coll Cardiol. 2007;50(19):1867-1875.
Originally derived from Morris CK et al. (1993) and St. James et al. cohorts; externally validated in large registries