Table 2.

Features extracted from each datatype collected by the Empatica E4

Datatype	Features Extracted
EDA	mean, mean derivative, standard deviation, number of peaks, mean prominence, mean width between peaks, dot product of the peak width and prominence, number of strong peaks, 20th percentile, quartile, 80th percentile
BVP	mean inter-beat interval (IBI), IBI standard deviation, root mean square, total power of IBI, low frequency power of IBI, high frequency power of IBI, normalized low frequency power of IBI, normalized high frequency power of IBI, low frequency power to high frequency power ratio of IBI, number of peaks, mean amplitude, standard deviation of amplitude, square average, percent of IBI greater than 50 milliseconds.
Triaxial Accelerometer (x, y, z)	total power, mean absolute difference of the norm, mean derivative, mean, median, skew, variance, standard deviation, maximum, minimum, interquartile range, zero crossing rate, kurtosis
Skin Temperature	mean, mean derivative