Fig. 7: Usability evaluated by the Mobile Application Rating Scale (MARS) and the System Usability Scale (SUS).

(Left) Rating of StableHandVR by the patients in the intervention group using the MARS questionnaire on a 5-point Likert scale. With the highest rating on Engagement (mean = 4.12, SD = 0.61) and Functionality (mean=4.26, SD = 0.44). (Right) The StableHandVR system achieved a mean score 85.3 indicating excellent usability on the SUS.