It has also been described as the “work horse” in clinical assessments (Crawford, Allum, & Kinion, 2008). One of the internationally most frequently applied neuropsychological test batteries is the Wechsler Adult Intelligence Scale (WAIS) (Ryan, Kreiner, Gontkovsky, & Glass Umfleet, 2015). Otherwise, this model and the four-subtest model are recommended to be used with caution. Applied on the Swedish version of the WAIS-IV the seven-subtest formula appears to be applicable on an FSIQ level, to be suitable for a younger sample, but not for an elderly.
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The best reduction of the seven-subtest short form was a four-subtest model, encompassing Block Design, Similarities, Arithmetic and Coding, one subtest from each index, but the t-tests indicated several cases of mismatches between the full WAIS-IV measures and the prorated scores. In the younger and middle aged sample (<55 years) results on FSIQ as well as index level were in accordance, whereas in the elderly group (∼55 years) they were incongruent. When the original WAIS-IV was compared to the seven-subtest short form the results showed a good congruence on FSIQ-level between the two sets, but on index level there were several cases of mismatches. WAIS-IV data from a non-clinical sample consisting of 261 participants ranging between 18 and 74 in age was analyzed with bivariate and multiple regression analyses, a prorating method for calculation of Full Scale IQ (FSIQ) and its indices as well as paired-samples t-test. The study aimed at investigating whether the seven-subtest short form based on WAIS-R (Ward 1990) was statistically valid to use on the Swedish version of Wechsler Adult Intelligence Scale, Fourth Edition (WAIS-IV), if this abbreviation was fit to catch the heterogeneity in test performance across age and if this brief measure was possible to abbreviate even more.
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