RESUMEN
AIM: To validate a French version of the Multiple Sclerosis Intimacy and Sexuality Questionnaire 15 which examines patients' perception of the effect of multiple sclerosis symptoms on their sexual activity. METHODS: After completing a translation/re-translation process to ensure linguistic and content validity, the Multiple Sclerosis Intimacy and Sexuality Questionnaire 15 French (MSISQ-15Fr) was completed by patients with multiple sclerosis. The validity of the construction, reliability, stability and reproducibility of the translation was evaluated. EXPLANATORY MIXED OBSERVATIONAL STUDY: Validation of a French assessment tool for sexual disorders (borrowed theoretical framework): the Multiple Sclerosis Intimacy and Sexuality Questionnaire 15 (MSISQ 15) RESULTS: The normed χ2 was 1.21, the root mean square error of approximation was 0.046 [0.00; 0.07], the comparative fit index was 0.974, and the standardized root mean square was 0.065. The calculated Cronbach's coefficients indicated strong internal coherence, and the intraclass correlation coefficient was satisfactory at 0.9. Translations of the Multiple Sclerosis Intimacy and Sexuality Questionnaire 15 (MSISQ-15) have already been validated in five languages. This French version is valid, stable and reproducible. It provides French-speaking nurses an accessible and appropriate tool that will enable them to play an active role in the sexual health strategy recommended by the World Health Organization.