## 2 Materials and Methods  
### Dataset  
Two datasets were considered in this research. The first was represented by the Wearing Position Study (WPS) acquired within Philips Research laboratories (2022). It contains three-axis acceleration measurements from nineteen healthy volunteers, ten males and nine females, while the second is the Simulated Hospital Study (SHS) acquired within Philips Research laboratories (2019). The SHS includes ten male and ten female healthy volunteers. Table 1 shows the age, weight, height, and BMI median and first and third quartiles of both WPS and SHS participants. Before starting the test, each participant was explained the protocol and afterwards was asked to signed an informed consent, obtained from all participants involved. Both studies, according to the regulations in the Netherlands, were waived as non-medical research, and therefore, approval by an IRB institution was not needed. The Internal Committee for Biomedical Experiments at Philips approved both studies. Each study was characterized by a specific protocol of activities to be followed (see Table 2) by the participants. The protocol was performed under the guidance and observation of two researchers, who annotated the start and end time for each activity. Self-paced activities (i.e., self-paced walking and self-push wheelchair) were acquired along a 30-meter corridor without obstacles.  
In the WPS study, five GENEActiv (GA) accelerometers [23] were used. Two were applied on the skin of the participant on the left lower rib (GA lower rib) and on the chest (GA chest) using body tape, while the other three were applied on a rigid support that simulates the position of a patient monitor device, with two of them pending from the neck (GA front and GA side) and the third one placed inside the pocket of a clinical gown (GA gown). In the SHS study, the sensors' setting included the GA front only. Figure 1 shows examples of a patient monitoring device usage in two different positions, front and side. The sampling frequency of all accelerometers was set to 100 Hz with a dynamic range of \(\pm 8\) g (\(1g=9.8\) m/s\({}^{2}\)).  
Once data acquisition was completed, signals were synchronized to the annotations based on the performed activities and synchronization patterns (i.e., three jumps at the beginning and end of the session). Signals were down-sampled to 16 Hz and split into windows of 6 s, with 4.5 s of overlap. No other preprocessing operation was applied; the development and testing of the models used raw acceleration data as input.  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & **Age** & \begin{tabular}{c} **Weight** \\ **[kg]** \\ \end{tabular} & \begin{tabular}{c} **Height** \\ **[cm]** \\ \end{tabular} & \begin{tabular}{c} **BMI** \\ **[kg/m\({}^{2}\)]** \\ \end{tabular} & **Age** & \begin{tabular}{c} **Weight** \\ **[kg]** \\ \end{tabular} & \
\begin{tabular}{c} **Height** \\ **[cm]** \\ \end{tabular} &
\begin{tabular}{c} **BMI** \\ **[kg/m\({}^{2}\)]** \\ \end{tabular} \\ \hline Median & 41.5 & 71.5 & 174.5 & 23.05 & 44.5 & 75.0 & 175.0 & 25.34 \\ \hline Q1 & 25.8 & 61.2 & 167.8 & 21.32 & 32.8 & 68.5 & 166.5 & 23.77 \\ \hline Q3 & 53.3 & 79.5 & 184.8 & 25.12 & 54.3 & 86.5 & 182.0 & 26.28 \\ \hline \hline \end{tabular}
\end{table}
Table 1: Median, first (Q1) and third (Q3) quartiles of the Wearing Position Study (WPS, left side) and Simulated Hospital Study population (SHS, right side) characteristics: age, weight, height, and Body Mass Index (BMI).