Statistical distribution of the basic features for SVB and VB-class evaluated for the beats in the training dataset that are supplied to the input of Stage 2.

Note:*All heartbeats that matched the reference template are assigned to SVB-class by Stage1.The discrete features (F1-F5) are reported as frequency of observation; the continuous features (F6-F20) are represented as Mean±Std. The top-10 ranked second-order feature interactions selected by Cluster, Fuzzy, LDA, CT models are denoted in the row of each involved feature, specifying the index of the coupling feature in the interaction. If one feature is involved in several interactions, then the order of their selection in the model is used to list the respective coupling features.