Fig. 3
From: Problems with Bazett QTc correction in paediatric screening of prolonged QTc interval
The top panels show the subject-specific correlations between RR intervals and QTc values calculated as QT/RRα; the bottom panels show the same for QTc values calculated as QT + β(1-RR), as dependencies on the values of coefficients α (top panels) and β (bottom panels). For each subject, one line is shown and where this line crosses the zero-correlation line, optimum coefficient α or β is found for the given subject, i.e. a coefficient that produces QTc values uncorrelated to the RR values. The panels with red and blue lines show the data of girls and boys, respectively. In the top panels, the light cyan and violet vertical lines show the correction coefficients of the Fridericia and Bazett correction, respectively. In the bottom panels, the dark green vertical lines show the correction coefficient of the Framingham correction