Eliana María Fuentes Mendoza

Objective: To evaluate the psychometric properties of the short version of the Token Test (SVTT) and the Rey–Osterrieth Complex Figure (ROCF) using an item response theory (IRT) framework and to establish normative data for Colombian children and adolescents based on ability scores. Methods: A total of 668 healthy participants aged 6–17 years took part in this study. Factorial structure was assessed through confirmatory factor analysis (CFA). Item parameters were estimated using a two-parameter logistic (2PL) model for the SVTT, which accounts for both item difficulty and discrimination in dichotomous responses, and a graded response model (GRM) for the ROCF, suitable for items scored on ordered categories reflecting increasing levels of performance accuracy and Differential Item Functioning (DIF) analysis was conducted to assess potential bias related to sex. Reliability was examined using the Test Information Function (TIF), internal consistency throughout Cronbach’s alpha, and the influence of sociodemographic variables was analyzed through regression models. Results: CFA confirmed unidimensionality for all measures. For most items, moderate-to-low ability was sufficient to achieve the highest scores in the ROCF, and low ability in the SVTT. DIF analysis indicated no meaningful sex-related bias in any of the subtests. Both tests showed excellent reliability and internal consistency. Copy scores were influenced by polynomial age and parents’ mean years of education (MPE), while both immediate recall in the ROCF and SVTT were affected by MPE and the interaction of logarithmic age. Conclusions: This study provides strong psychometric evidence and, together with the integration of digital tools for generating normative data, represents a meaningful advancement in neuropsychological assessment.

Objective: To evaluate the psychometric properties of the Shortened Version of the Token Test (SVTT), the Peabody Picture Vocabulary Test (PPVT-III), and the Rey–Osterrieth Complex Figure (ROCF) using an item response theory (IRT) framework and to establish normative data for Waranka children and adolescents based on their ability scores. Methods: A total of 436 healthy people aged between 6 and 17 participated in this study. The factor structure was evaluated using confirmatory factor analysis (CFA) and the difficulty and discrimination parameters using IRT through the two-parameter logistic model for the SVTT and PPTV-III, while for the ROCF, the graded response model was used. The ordinal alpha and McDonald’s omega were used for reliability. Results: For most items, a low ability was enough to achieve the highest scores for the ROCF and SVTT. For the PPVT-III, the items aligned sequentially based on the difficulty, and a low level of ability was enough to achieve the highest score for the first 40 items. The ROCF, SVTT, and PPVT-III demonstrated adequate reliability. The ROCF copy and immediate recall scores were influenced by the mean parents’ years of education (MPE) and quadratic age interaction. The SVTT performance was affected by the quadratic age and sex interaction, and the PPVT-III by the interaction effect of the MPE and quadratic age. Conclusions: This is the first study to analyze the psychometric properties of the ROCF, SVTT, and PPVT-III through IRT models that are accurate and relevant for the validity of the obtained data and generate normative data in the under-represented nation of Ecuador for clinical and research purposes.