| Patient characteristics |
| Prior myocardial infarction |
| Abnormal rest ECG |
| Degree of coronary stenosis |
| Extent of coronary stenosis |
| Age |
| Gender |
| Drugs |
| Intraobserver variability |
| ECG interpretation |
| Angiographic interpretation |
| Exercise protocol |
| Exercise end points |
| Patient position |
| Exercise lead system |
| ECG criteria for positivity |
