Heiko Lehrmann et al. JACEP 2018;j.jacep.2018.03.007 V1 Jump Scatterplot and ROC Curve (A) V1 jump scatterplot of patients in the retrospective cohort, the validation cohort, and all patients (3 columns). Each column depicts patients without anterior mitral line block on the left (circles) and patients with AML block on the right (diamonds). The green dashed line indicates the proposed cutoff value of 24 ms based on the receiver-operating characteristic (ROC) curve of the retrospective cohort. The red solid line shows the suggested cutoff value of 30 ms based on (B) the ROC curve of all patients. In A, whisker plots show mean and standard deviation in the left 2 columns (normal distribution) and median and interquartile range in the right column (skewed distribution). AUC = area under the receiver-operating characteristic curve. Heiko Lehrmann et al. JACEP 2018;j.jacep.2018.03.007 2018 The Authors