*3.2. Data Processing*

This study comprehends the use of accelerometer data with a low-pass filter application to clean the data [67,68]. It consists of the first step of the data processing, and this module is finalized with the extraction of the different statistical features. They are the same as the ones described in [20], but only provided by the accelerometer data, including the five largest distances between the maximum peaks; the mean, standard deviation, variance, and median of the maximum peaks; and the standard deviation, mean, maximum and minimum values, variance, and median of the raw signal.
