The comparison of standard features of signals observed from the training and test sets.

The sAP (Type A only) amplitudes exhibit smaller amplitudes in the test set compared to the training set (p < 0.01—marked ‘**’ in the table), the reason for which is explained in the text. Rest of the parameters have comparable values for training and test sets (p > 0.05). The parameter values are given as mean ± SD. Number of signals used in Training set: 2487 sEJPs and 1013 sAPs; in Test set: 477 sEJPs and 453 sAPs.