E-ISSN : 2733-4538
Kim(1999) has proposed a method of eating premorbid intelligence, which is based on age-and-education specific IQ means of K-WAIS standardization sample. The purpose of the present study was to examine the validity of the method. A sample of 167 normal subjects were administered K-WAIS and their observed IQs and predicted IQs were compared. The error size in estimating FIQ was less than 6 points in 37% of subjects, less than 11 points in 64%, and less than 16 points in 82%. These estimation efficiencies are comparable to these reported for regression-based methods in prior studies, which took into account more number of demographic variables than Kim's method. Kim's method is only 10~20% more efficient than the simple-minded method of predicting all subjects' IQs as 100. These results indicate that Kim's and other demographic methods do not provide a sufficiently satisfactory means of predicting premorbid intelligence. However, the demographic method represents the most sophisticated and objective means of estimating premorbid intelligence among presently available methods. Thus, their cautious use is still recommended.