3.5 Optimal AWT of lesser LGE areas predicting AF drivers
An ROC curve analysis yielded an optimal cutoff value of 2.24 mm for predicting the presence of an NPA in lesser LGE areas. As for the optimal AWT, the sensitivity, specificity, and positive and negative predictive values for the cutoff values were 85.0%, 59.5%, 27.4%, 95.7%, respectively. When the sensitivity rather than specificity was prioritized, the optimal cutoff value was 2.08 mm. When the specificity rather than sensitivity was prioritized, the optimal cutoff value was 2.40 mm. The sensitivity, specificity, and positive and negative predictive values for each cutoff value are shown in Table 2 . A representative case is shown in Figure 4 . Five NPAs were found in lesser LGE areas where the AWT was thicker than 2.24 mm.