System Usability (OAs)
The overall SUS score was 68.1 (SD 18.8; n=45) and fell below the predefined 70-point score considered acceptable. When considering the individual countries, the scores differed, revealing acceptable usability in Switzerland (mean 81.5, SD 13.0), borderline acceptable usability in Cyprus (mean 69.3, SD 15.2), and unacceptable usability in Italy (mean 53.5, SD 17.0).