QTc for Each of the Different QTc Formulae in a Person Who Had 3 ECGs at Different Heart Rates
The slope of the relationship between QTc and heart rate was calculated from linear regression and was the smallest for QTc spline (0.015) and not significantly different (p = 0.84) from zero. In contrast, there were positive slopes to the relationships that were significant for QTcBZT (slope = 0.685; p < 0.001) and QTcDMT (slope = 0.231; p = 0.024) but not for QTcHDG (slope = 0.285, p = 0.23). There were negative slopes to the QTc heart rate relationship which were significant for QTcFRM (slope = −0.454; p = 0.019) and QTcRTH (sex adjusted) (slope = −0.085; p = 0.03) but not for QTcFRD (slope = −0.139; p = 0.0812). Abbreviations as in Figure 3.