Intelligence Scale For Chinese Adult: The Development Of National Norms, Reliability And Validity

Objective: The Intelligence Scale for Chinese Adult (ISCA) was recently developed by Clinical Psychological Research Center, Second Xiangya Hospital of Central South University. The ISCA contains eleven core subtests and an additional subtest, four of which were designed to measure crystallized intelligence (Vocabulary, Similarities, Information, and Comprehension), four developed to evaluate fluid intelligence (Picture Completion, Block Design, Matrix Reasoning, and Picture Arrangement), and three intended to assess memory and attention (Digit Symbol-Coding, Arithmetic, and Digit Span). An early evaluation of both the reliability and construct and criterion-related validity of this measure has been completed. The purpose of this study was to develop the national norms of ISCA for adults ranging age from 16 through 64 years and examine its psychometric characteristics.Methods: The ISCA standardization was completed on 1600 adult subjects. 2000 Census data was applied to the standardization sample in order to correctly represent individuals according to age, gender, educational level, geographic region, and occupation. ISCA will provide a variety of scores such as age-corrected scaled scores, IQ scores, Index scores and percentile rank. The reliability analysis includes split-half reliability, test-retest reliability, standard error of measurement, inter-rater reliability and generalizability analysis. The validity analysis consists of construct validity, criterion-related validity and discriminant validity.Results: 1.Norms: The sums of subtest scaled scores for the ISCAIQ and Index scores were formed by summing each individual's actual age-corrected scaled scores on the relevant subtests. For each scale, the distribution of the sums of scaled scores was converted to a scale with a mean of 100 and a standard deviation of 15. This conversion was accomplished by preparing a cumulative frequency distribution of actual sums of scaled scores for each scale and index, smoothing and normalizing these distributions, and then calculating the appropriate IQ and Index score equivalent for each sum of scaled scores. These normative scores were reported in the user's manual in retail. 2. Item...