Preliminary validation of the Spanish version of the Frontal Systems Behavior Scale (FrSBe) using Rasch analysis

To explore the construct validity of the Spanish version of the Frontal Systems Behavioral Scale (FrSBe) using Rasch modelling. Methods: Item responses of 245 Spanish subjects were analysed using Rasch analysis: self-rating of 65 participants with TBI or stroke (sample A), family-rating of the same 65 participants (sample B) and self-rating of 115 healthy individuals (sample C). Results: After removing or grouping several problematic items, the Apathy and the Executive Dysfunction sub-scales were found to be valid measures for samples A and B and the Disinhibition sub-scale was valid for samples B and C. Person Separation Index of reliability of sub-scales was greater than 0.83 for sample B and 0.72 for A and C. All items showed disordered threshold categories in samples A and B and five items were ordered in sample C. Conclusions: With a few modifications, the sub-scales of the FrSBe-Spanish version are adequate measures for the assessment of the behavioural syndromes derived from frontal systems dysfunction in persons with brain injury. The family-rating form is preferable to the self-rating form. Only the Disinhibition scale is a valid measure for the behavioural assessment of the normal population. A reduction of response categories is suggested.