Translation and Validation of the System Usability Scale in a Danish Mental Health Setting Using Digital Technologies in Treatment Interventions

The use of technology in the treatment of mental health problems is increasing. The System Usability Scale (SUS) is a widely used standardized questionnaire for assessment of perceived usability of technology. European translations and validations have been conducted, but none in Danish. The aims of this study were to translate the scale into Danish (SUS-DK) and examine the psychometric properties in a mental health sample using digital technologies in treatment interventions. We included 138 participants from a Danish mental health service using computer programs, video consultations, apps and virtual reality. The original SUS was translated according to the recommendations by the International Society for Pharmacoeconomics and Outcomes Research (ISPOR). The linguistic adaptation led to a conceptual equivalent Danish version of SUS and the psychometric evaluation found high internal consistency (Cronbach's alpha = 0.87). The SUS-DK is recommended for measuring perceived usability of technology in a Danish treatment context.