Assessing Hearing-Related Quality of Life in Adults With Hearing Loss: Validation of the German Cochlear Implant Quality of Life (CIQOL)-35 Profile

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Abstract
Hearing-related quality of life is a crucial outcome for adults with cochlear implants. The Cochlear Implant Quality of Life (CIQOL)-35 Profile is a patient-reported outcome measure originally developed in English. In a previous study, this instrument was cross-culturally adapted into German to address the need for standardized assessment tools in German-speaking regions. To ensure the adapted instrument meets psychometric criteria, validation is required. The German adaptation of the CIQOL-35 Profile was validated through an online survey including questions on demographics, the German CIQOL-35 Profile, and the German Nijmegen Cochlear Implant Questionnaire (NCIQ). The collected data were analyzed for reliability and validity. A total of 204 adults (aged 19–87 years) with bilateral hearing loss completed the online survey. Cronbach's α between 0.84 and 0.91 demonstrates good internal consistency for all subscales of the CIQOL-35 Profile and the global outcome. Moderate to strong correlations ( r s = 0.55–0.85) between the CIQOL and NCIQ indicate good convergent validity. Confirmatory factor analysis established construct validity for the German CIQOL instruments. These findings confirm that the adapted German version of the CIQOL instruments is a reliable and valid measure for assessing hearing-related quality of life in adults with cochlear implants and demonstrates higher validity than the NCIQ. The availability of the CIQOL in multiple languages facilitates international comparability of research results and increases clinical application. Implementing quality of life instruments in clinical practice enables a more comprehensive evaluation of patient outcomes and may help identify patient needs that may be addressed in therapy and rehabilitation.

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