Figure 4
From: Physiologic heart rate dependency of the PQ interval and its sex differences
The panels on the top row show the cumulative distribution of subject-specific hysteresis constants of the curvilinear regression models of the PQ/RR relationship on the left and of the QT/RR relationship on the right. The curves of the red and blue lines correspond to the distributions in females and males, respectively. The panels of the middle row show comparisons of the hysteresis time constants between females (red circles with red error bars) and males (blue squares with blue error bars) in sub-populations defined by the source clinical centre of the study (see the text for details). The graphs show medians and inter-quartile ranges, the sizes of the marks indicate the numbers of subjects in the sub-populations. The panels on the bottom row show the scatter diagrams of the individually optimized hysteresis time constants against the ages of the study subjects. The red/pink circles correspond to females, the blue/azure squares to males. In each panel, the solid red and solid blue lines show the linear regressions between the hysteresis time constants and age in females and males, respectively. The red shaded and blue shaded areas are the 95% confidence intervals of the regression lines; the violet areas are the overlaps between the confidence intervals of the sex-specific age-regressions.
