The comparison of WAIS-R and Wechsler-Bellevue tests

There is little published experience with the Czech version of WAIS-R, standardized on Czech population. A sample of 40 epileptic patients, aged on an average 31,9 years (SD = 8,2), was examined by the W-B method and after approximately 7 years, aged on an average 38,6 years (SD = 9,5), the WAIS-R method was applied. When using the W-B method the mean values were CIQ = 107,0 +/- 12,5, VIQ = 107,1 +/- 13,3, PIQ = 105,7 +/- 13,2. Using the WAIS-R method they were CIQ = 98,9 +/- 11;2, VIQ = 99,2 +/- 11,4, PIQ = 96,1 +/- 11,9. The correlation of both tests were 0,819 in CIQ, 0,845 in VIQ and 0,675 in PIQ respectively. The significant correlations with the education in both the methods are basically the same. The correlations with the age are statistically non-significant in both cases, but in WAIS-R clearly lower what gives evidence of better psychometric qualities of WAIS-R. When analysing the particular cases the two extreme subgroups can be distinguished: a) the subgroup of five persons showing extraordinary great lowering of IQ values in the second measurement (by WAIS-R method), more than 15 points of CIQ, b) the subgroup of five persons showing in the second measurement (by WAIS-R method) the increase of IQ values, in spite of the greater difficulty of WAIS-R. In all persons with the extreme changes of IQ values there are clear relations to the changes in the attack frequency and/or to the social and psychological adaptation. The results give evidence of good psychometric characteristics of the Czech version of WAIS-R, but also of the need for repeated control examinations of the intelect performance.