Statistics and psychometrics for the CAT-N: Documenting the Comprehensive Aphasia Test for Norwegian

Background Ivanova and Hallowell Citation2013 emphasise the importance of reporting on test development psychometric properties tests in international journals. Such documentation may serve as references for other developers enable researchers clinicians to assess reliability validity issues made a language unknown them.The CAT (Comprehensive Aphasia Test) is general aphasia which examines linguistic skills broadly, within cognitive neuropsychological tradition; it has been being adapted number languages.Aims The aim this article document statistical procedures used standardisation Norwegian adaptation (CAT-N), its properties, discuss issues.Methods & CAT-N involved careful design subtests items, taking into account features like word frequency, imageability phonological language-specific variables. prototype was tested normative sample 85 persons with control group 84 without aphasia. items some were reordered based norming. A new scoring scheme developed two Picture description. includes Impact Questionnaire (AIQ), patient reported outcome measure CAT.Outcomes Results Statistical methods are documented discussed. Descriptive statistics domains presented. Internal consistency partial inter-rater intra-rater aspects investigated documented. Construct by factor analysis. Sensitivity specificity through pairwise comparisons use normal-language cutoff values. Concurrent results from an existing (NBAA).Conclusions shown have good validity, distinguishes well between provides explicit decisions be useful future adaptations CAT.