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QTc values for normal and prolonged QT interval after correction with Bazett’s formula6
| QTc values by age group and sex (ms) | |||
| 1–15 years | Adult males | Adult females | |
| Normal | <440 | <430 | <450 |
| Borderline | 440–460 | 430–450 | 450–470 |
| Prolonged (top 1%) | >460 | >450 | >470 |
