Utility of the WASI–II 2-Subtest Full Scale IQ for Identifying Impaired Cognitive Functions

Authors

Joseph J. Ryan, University of Central MissouriFollow
David S. Kreiner, University of Central MissouriFollow
Samuel T. Gontkovsky, Empower Behavioral Health and InterventionFollow

Abstract

This study focused on how accurately the WASI–II 2FSIQ predicts the 4FSIQ. If two subtests can identify intellectual disability, a low score might prompt a switch to the WAIS–IV or WISC–V prior to completing the four WASI–II subtests. Participants were 94 individuals with psychiatric or neurological disorders (age M = 49.04 yrs, education M = 13.48 yrs) seem for clinical evaluation. The correlation between the 2FSIQs and 4FSIQs in the total sample was high, r(92) = .96, p < .001, but the former cannot be relied upon to predict 4FSIQs. It overestimated 4FSIQs in 69.1% of the cases, with only 50% of the 2FSIQs falling within + 3 points of the 4FSIQs. However, classification accuracy statistics indicated that the 2FSIQ effectively screened for the presence of intellectual disability. A 2FSIQ standard score cutoff of ≤ 79 yielded a high probability that the 4FSIQ was also at or below the cut score.

Recommended Citation

Ryan, Joseph J.; Kreiner, David S.; and Gontkovsky, Samuel T. (2026) "Utility of the WASI–II 2-Subtest Full Scale IQ for Identifying Impaired Cognitive Functions," Archives of Assessment Psychology: Vol. 15, Article 10.
Available at: https://nsuworks.nova.edu/psyassessment/vol15/iss1/10