Our results confirmed older tests such as the NART are likely to significantly overestimate premorbid intellectual functioning and should be used with caution.ĭifferences in predicted FSIQ scores based on UK and US norms point to a need for future Australian standardisations of these tests. We replicated previous research and found results that were consistent with the Flynn effect in estimating premorbid intellectual functioning across the TOPF, WTAR and NART2 and NART. There is some evidence indicating word reading tasks might be impacted by the Flynn effect. Word reading tasks reliably and validly estimate premorbid intellectual functioning in patients with neuropsychological impairment. The Flynn effect is the well-known observation that population intelligence is increasing by 3 IQ points per decade. Our results support the need for Australian standardisations of these instruments. Our findings indicated tests of premorbid functioning appear to be subject to the Flynn effect, and clinicians should exercise caution in using older word reading tasks such as the NART.
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