Quebec Sleep Questionnaire (QSQ)
The QSQ is a 32-item scale designed to assess health-related quality of life in patients with Obstructive Sleep Apnea (OSA). The instrument evaluates the impact of apnea in five different domains: hypersomnolence, daytime symptoms, nighttime symptoms, emotions, and social interactions. Developers Lacasse and colleagues  created the questionnaire for use in clinical trials as a method for evaluating treatment-induced changes. It was originally developed and validated in French (French-Canadian). This English version was provided by the authors, which they obtained from a translation/back-translation process.