Simon W. Rabkin et al. JACEP 2017;3:

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Simon W. Rabkin et al. JACEP 2017;3:756-766 QT Versus Heart Rate for Men and Women Boxplots of the QT interval measurements for the NHANES cohort by heart rate, for men (left) and women (right). Boxplots are grouped into heart-rate intervals of 5 beats/min. The black horizontal line in the middle of each box denotes the median for the corresponding heart rate interval. The top and bottom of the box denote the first and third quartiles for the heart rate interval, and the endpoints of the whiskers; the lines extending from the boxes denote 1.5 times the interquartile range from the first and third quartiles. Outliers are points that fall beyond the whiskers and are plotted as points (the same approach is used in Figures 2, 3, and 4). The QT-heart rate relationship is shown by a solid line layered over the boxplot, which was constructed by fitted splines for each sex. Simon W. Rabkin et al. JACEP 2017;3:756-766 2017 American College of Cardiology Foundation