Psychometric properties of the French version (Impact measure; IM-45) of the Outcome Questionnaire-45 (OQ-45) in clinical and university settings

This study examined the psychometric properties of the Mesure d'impact 45 (MI-45), which is the French translation of the commonly used scale called Outcome Questionnaire-45 (OQ-45). The measure is a self-report tool designed to evaluate change in client functioning in the context of receiving mental health services. We recruited two nonclinical samples of university students as well as a clinical sample from a university-based training centre that delivers psychological services to the community. The MI-45 and other measures completed by the participants in these samples are presented. The psychometric properties calculated based on participants' responses suggest the French MI-45 is comparable to the original English version and the versions available in other languages. The MI-45 additionally demonstrates good agreement with the English version completed by bilingual nonclinical participants as well as a good convergent validity with measures of psychological symptoms or, inversely, measures of psychological wellbeing.