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* SSS values < 4 are understood as normal. However, it might not be zero and that is because there are myocardial regions that show lower radiopharmaceutical concentrations and, consequently, receive values other than zero [25-26].
SSS: Summed stress score
| Summed stress score (SSS) | Interpretation |
| < 4 | Normal* |
| 4-8 | Mildly abnormal |
| 9-13 | Moderately abnormal |
| > 13 | Severely abnormal |
