부산대학교 도서관

This study developed a regression formula for prediction of pre-morbid abilities using the National Adult Reading Test (NART), standardised for use in New Zealand, and including examination of the contribution of variables such as age, gender and ethnicity to prediction. Participants were 113 New Zealand born adults (age range 18 to 84; mean= 35.38; SD= 13.59), of whom 56 (49.6%) were male. Pakeha/Europeans comprised 80.5% (n= 91) of the sample while 18.6% (n= 21) were Māori, and one participant identified as of Pacific Island ethnicity. Participants completed the NART and subtests of the WAIS-III required to calculate Full Scale, Verbal and Performance Intelligence scores (FSIQ, VIQ, PIQ). Consistent with the literature Māori participants produced significantly lower scores than Pakeha on the indexes of the WAISIII, whereas this was not the case for the NART. Increased age was also significantly related to lower WAIS-III performance but was not significantly related to the NART. Both NART and WAIS performance were significantly affected by years of education. Regression formulae were then developed to predict WAIS-III intelligence scores from NART error score, ethnicity, age, gender, and years of education. The original NART formula explained 42% of the variance in FSIQ in this sample, whereas the New Zealand formula developed here explained 82.1% of the variance in FSIQ. The New Zealand formulae also explained 71.9% of variance in VIQ and 40.5% of the variance in PIQ. These formulae predicted ability level well within the superior/very superior ranges of performance and tended to overestimate ability for those in the average and high average ranges of ability. [ABSTRACT FROM AUTHOR]