Validating the German Translation of Revised Comprehensive Autistic Trait Inventory

Background: This project evaluates the psychometric properties of a German translation of the Revised Comprehensive Autistic Trait Inventory (CATI-R). Previous measures of autistic traits are often based on a male-referenced conceptualisation of autism, which may underestimate autistic traits in other genders. Additionally, these measures tend to rely on neurotypical language, which can make it difficult for autistic people to respond and may reinforce stigma. To address these shortcomings, the Comprehensive Autistic Trait Inventory (CATI) was originally developed as an alternative to traditional measures, including subscales that capture traits particularly relevant to autistic women. Building on this, we collaborated with members of the autism community to revise the CATI (CATI-R), ensuring more inclusive, respectful, and accessible language and concepts across all genders. In the present study, we translated this revised measure into German and validated it in a large sample of female, male, and non-binary participants. This study explores if the German translation of the CATI-R measures autistic traits fairly across genders and identifies potential differences in trait expression.  Methods: To validate the German CATI-R, we analysed data from a large sample (n = 1057), comprising German native speakers with a self-reported autism diagnosis (n = 29), people who self-identified as autistic (n = 84), and non-autistic participants (n = 944).  Results: We successfully validated a German translation of the CATI-R. A confirmatory factor analysis supported the six-subscale structure (Two-Factor Bifactor Model: Chi-squared = 2402.85, p .37, ps <.001). Moreover, we demonstrated convergent validity with significant correlations between the German versions of the CATI-R, AQ and BAPQ: the AQ (rho = .69, p < .01) and BAPQ (rho = .77, p < .01). Finally, a measurement invariance analysis indicated that total-scale scores can be compared across genders and across the English and German CATI-R.  Conclusions: This study replicates findings for the English CATI-R. To our knowledge, this is the first validation of a measure of autistic traits in German that has been developed together with people from the community.