Fig 4. Validation results of the μQTobs VS QTalg.

A linear regression between μQTobs and QTalg. B Bland-Altman analysis shows no bias (solid black line) and narrow limit of agreements (dashed lines). C The Distribution of differences shows that the differences are normally distributed around zero. All numbers corresponding with this figure can be found in Table 2. QTalg = QT-interval determined by the algorithm, μQTobs = mean QT-interval determined by three observers, SD = standard deviation, ms = milliseconds.