## 6 Case Study
### Data Gathering
To evaluate usability, we used a standard system usability scale (SUS) [40] aiming to examine users' impression of the comfort of use of the system in general, along with a designated questionnaire asking the respondents to describe the degree of comfort and clarity of use for each of the system's operating phases. It was found that female nurses rated the comfort and clarity of use slightly higher than male nurses, and the scores given were mostly high (above four). Results also suggest that the older the respondent, the higher the ranking. However, the system's SUS score was high on average (64.32 when the minimum required is 68). Grades ranged from 45 to 87.5 and indicate that there is a clear gender distinction. Male nurses gave higher grades in general (males: 70, females: 57.5). We also found an inverse ratio between the grades and age factor: the older the respondent, the lower the grade--Table 3 sums up the data from both questionnaires. \begin{table}
\begin{tabular}{c c c} \hline Total & & **N** \\ \hline Gender & Males & 6 \\ \cline{2-3}  & Females & 5 \\ \cline{2-3}  & \textless{}35 & 3 \\ \cline{2-3}  & 36-45 & 6 \\ Age & 46-55 & 1 \\ \cline{2-3}  & 56\textless{} & 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Participant data from Rambam Hospital. \begin{table}
\begin{tabular}{c c c} \hline Total & & **N** \\ \cline{2-3}  & & 22 \\ \hline \hline \multirow{2}{*}{Gender} & Males & 7 \\ \cline{2-3}  & Females & 15 \\ \cline{2-3}  & \textless{}35 & 8 \\ \cline{2-3}  & 36-45 & 4 \\ \cline{2-3}  & 46-55 & 6 \\ \cline{2-3}  & 56\textless{} & 4 \\ \hline \end{tabular}
\end{table} 
Table 2: Participant data from Kaplan Medical Center. The last part relates to the issue of trust in the system. The questionnaire included 24 positive and negative statements regarding general confidence in the system and trust in specific actions. Participants were asked to rank their level of agreement for each one. In order to calculate the degree of trust, we considered only questions addressing general trust in the system, excluding questions relating directly to specific operations or concerning trust in general. At the same time, we calculated the average grade participants gave specific operations. Table 4 sums up these data. Women expressed a lower level of trust toward the AnapnoGuard system in every tool used for the study. In addition, women expressed a lower level of trust toward technologies in general, yet indicated they adopt and use new technologies more often than men ([PERSON]) or in an equal manner ([PERSON]). Figure 14 illustrates the correlation between gender and trust. Among male nurses, we found a definite link between the system's SUS score and users' trust; a positive correlation exists (R = 0.752) between the SUS score and the trust level (\(p<0.05\)), as shown in Figure 15. These findings match previous studies' conclusions that found a definite link between the two [16]. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & & \multicolumn{2}{c}{Suestiff Positive Trust} & \multicolumn{2}{c}{General trust} \\  & & (R-S) & (R-S) \\ \hline Total & & 11 & 3.72 & 3.17 \\ \hline \multirow{2}{*}{Gender} & Males & 5 & 3.88 & 3.45 \\ \cline{2-5}  & Females & 6 & 3.53 & 2.82 \\ \hline \multirow{2}{*}{Age} & \textless{}35 & 3 & 4 & 3.5 \\ \cline{2-5}  & 36-45 & 6 & 3.5 & 3.04 \\ \cline{2-5}  & 46\(<\) & 2 & 4 & 3.06 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Summary of the trust questionnaire. Figure 13: Evaluating the aesthetic perception of the system. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & & \multicolumn{2}{c}{Physical Stability} & \multicolumn{2}{c}{SUS} \\  & & (R-S) & (R-S) \\ \hline Total & & 11 & 4.28 & 64.32 \\ \hline \hline \multirow{2}{*}{Gender} & Males & 6 & 4.17 & **70** \\ \cline{2-5}  & Females & 5 & 4.41 & **57.5** \\ \cline{2-5}  & \textless{}35 & 3 & 4.15 & **76.67** \\ \cline{2-5} Age & 36–45 & 6 & 4.23 & 62.92 \\ \cline{2-5}  & 46\(<\) & 2 & 4.65 & 50 \\ \hline \hline \end{tabular}
\end{table}