2.9 Statistical analysis
Data are expressed as percentages for the nominal variables, medians for
the ordinal variables, and means for the continuous variables. Discrete
variables were compared using the chi-square or Fisher exact test as
appropriate. ROC curves were used to determine the LGE-entropy and
LGE-volume ratio that provided the best sensitivity and specificity for
the NPAs. A value of p < 0.05 was considered statistically
significant. All statistical analyses were performed using SPSS, Release
24 software (SPSS, Chicago, IL, USA).