Figure 3.

Schematic diagram showing the most used three‐category classification schemes in TWA testing with the SM technology. Most two‐category schemes are based on grouping together positive and indeterminate tests in an “abnormal” cluster, though some may group only those indeterminate tests with specific indeterminacy causes. See text for information. Abbreviations used: MaxHR = maximum heart rate achieved in the test; MaxNegHR: maximum heart rate in the test with clearly no TWA. It is calculated backward, from the maximum heart rate to the basal heart rate.