Five-factor structure of the RBANS is supported in an Alzheimer's disease sample: Implications for validation of neuropsychological assessment instruments.

Development of the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) was theoretically driven, with the goal of providing an assessment of abilities across five cognitive domains. Since its development, numerous factor analytic studies have failed to provide empirical support for the proposed five-factor structure and, furthermore, have lacked consensus on the internal structure of this instrument. A key limitation of these prior studies is the use of normal or mixed clinical samples, a practice that can obscure distinctions that may be evident in specific homogeneous clinical samples. The current study examined the factor structure of the RBANS in a sample of 107 male Veterans diagnosed with probable Alzheimer's disease (AD). Confirmatory factor analysis of a model reflecting the five Index Scores (Immediate Memory, Visuospatial/Constructional, Language, Attention, and Delayed Memory) found that the proposed five-factor structure fit the data well. These findings suggest that the RBANS does measure five distinct constructs and use of Index Scores is appropriate. Furthermore, the current findings highlight the importance of testing construct validity of neuropsychological assessment instruments in specific homogeneous samples.