Reliability and Validity of Chinese Cognitive Ability Scale / 中国心理卫生杂志

ABSTRACT

Objective: To examine reliability and validity of Chinese Cognitive Ability Scale (CCAS).Methods:The CCAS was administered 321 children, 275 adults, 32 patients with brain damage, and 31 children with mental retardation.Out of them, 26 children were tested with WISC-CR and 26 adults with WAIS-RC.Results: The test-retest reliability coefficients of subtests and scales ranged from 0.732 to 0.894, 0.919 to 0.960 for children, 0.859 to 0.937, 0.968 to 0.981 for adults; The reliability coefficients for children (quick coding was omitted) ranged from 0.810-0.928 (Split-half), 0.737-0.923 (Cronbach's ?) and 0.737-0.945 (generalizability) for subtests, 0.939-0.976,0.898-0.965 and 0.898-0.965 for scales; Coefficients for adults ranged from 0.829-0.948, 0.747-0.941 and 0.747-0.941 for subtests, 0.945-0.979, 0.915-0.967 and 0.915-0.967 for scales; The CCAS IQs were high correlated with WAIS-RC IQs (VIQ=0.775,PIQ=0.621,FIQ=0.724) and WISC-CR IQs (VIQ=0.888,PIQ=0.779,FIQ=0.886) , the CCAS VIQ, PIQ, and FIQ were 5.3,9.2,and 7.8 points less than WAIS-RC, and 2.0,7.2,and 5.0 points less than WISC-CR; Comparing with normal groups, mean IQs of brain damaged adults(VIQ=80.50,PIQ=80.59,FIQ=78.91) and mental retardation children(VIQ=43.68,PIQ=49.77,FIQ=44.06)were much lower.Conclusion: The Chinese Cognitive Ability Scale has excellent retest stability, internal consistency reliability, convergent and discriminant validity.