 13. For a treadmill test result to support inclusion it must terminate in the presence of angina for either of the following reasons: a angina becomes too severe to continue the test AND there must be a horizontal depression or downsloping ST-segment of at least 1 mm measured 80 ms from the J point as subsequently established by the Biomedical Systems central ECG lab, or b angina of any grade AND there must be a horizontal depression or downsloping ST-segment measured 80 ms from the J point of 2 mm during exercise. The qualifying time for the treadmill test will then be the time to a horizontal depression or downsloping ST-segment of 1 mm compared to the pre-exercise ST segment as subsequently established by the Biomedical Systems central ECG lab. 