52 Chapter 3 Table 1 Continued. Participant number Gender Age (years) SUSa score (0-100) 4 Female 33 90 5 Female 38 92.5 6 Female 45 97.5 7 Female 52 77.5 8 Male 71 85 9 Male 20 92.5 aSUS-score = Systems Usability Scale. Data analysis revealed 11 categories distributed among the 3 themes “acceptability,” “satisfaction,” and “performance.” “Acceptability” describes what was required for participants to accept the app as part of their treatment. The categories grouped under “satisfaction” describe the perceived benefits of using the app during treatment. The theme “performance” contains a single category with the same name and describes the most important app functions according to the participants, as well as suggestions to improve the performance of the app. Acceptability Usability The app was easy to use, according to the participants. The app was simple in design, which made it very accessible. I think it just has to be simple, without too many bells and whistles, and for me, it worked like that. [Participant #3] Availability The availability of the exercises on the patients’ smartphones was perceived as an advantage because using a smartphone was already integrated into their daily lives. None of the participants experienced the requirement to own a smartphone in order to use Physitrack as a problem. It’s just very easy. You carry your phone with you every day anyway, so when you forget something, you can just open the app and find it; very easy. [Participant #7]
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