Exercise Stress Testing Outcomes*
| Cardiac Outcomes† | |||||
|---|---|---|---|---|---|
| Treadmill Result | Yes | No | Total | Value | CI |
| Positive‡ | 5 | 32 | 37 | ||
| Negative | 2 | 300 | 302 | ||
| Total | 7 | 332 | 339 | ||
| Sensitivity | 0.7143 | 0.3589–0.9178 | |||
| Specificity | 0.9036 | 0.8671–0.9309 | |||
| PPV | 0.1351 | 0.0591–0.2797 | |||
| NPV | 0.9934 | 0.9762–0.9982 | |||
| Positive likelihood ratio | 7.4110 | 4.1800–13.1400 | |||
| Negative likelihood ratio | 0.3160 | 0.0980–1.0210 | |||
| Probability of disease | 0.0260 | 0.0100–0.0419 | |||
| Overall accuracy | 0.8997 | 0.8631–0.9286 | |||
* Calculations were based on formulas from http://faculty.vassar.edu/lowry/prop1.html. Formulas for confidence intervals from Newcome RG. Two sided confidence intervals for the single proportion; comparison of seven methods. Stat Med 1998;17:857–72.
† Cardiac outcomes included myocardial infarction, cardiac catheterization with angioplasty and stenting, coronary artery bypass graft, new diagnosis of coronary artery disease, and cardiac death.
‡ Equivocal results are included as positive tests.