Univariate and Multivariate Base Rates of Score Elevations, Reliable Change, and Inter-Rater Discrepancies in the BRIEF-A Standardization Samples.

The Behavior Rating Inventory of Executive Function-Adult Version (BRIEF-A) is a standardized rating scale of subjective executive functioning. We provide univariate and multivariate base rates (BRs) for scale/index scores in the clinical range ( scores ≥65), reliable change, and inter-rater information not included in the . Participants were adults (ages = 18-90 years) from the BRIEF-A self-report ( = 1,050) and informant report ( = 1,200) standardization samples, as well as test-retest ( = 50 for self, = 44 for informant) and inter-rater ( = 180) samples. Univariate BRs of elevated scores were low (self-report = 3.3%-15.4%, informant report = 4.5%-16.3%). Multivariate BRs revealed the common occurrence of obtaining at least one elevated -score across scales (self-report = 26.5%-37.3%, informant report = 22.7%-30.3%), whereas virtually none had elevated scores on all scales. Test-retest scores were highly correlated (self = .82-.94; informant = .91-.96). Inter-rater correlations ranged from .44 to .68. Significant ( < .05) test-retest -score differences ranged from 7 to 12 for self-report, from 6 to 8 for informant report, and from 16 to 21 points for inter-rater -score differences. Applications of these findings are discussed.