Correlation among demographic estimates of intellectual abilities, performance IQ scores, and verbal IQ scores in non-braindamaged and aphasic adults

Abstract

Multiple regression equations based on demographic information are often used to estimate verbal and non-verbal intellectual function in persons with brain damage. Although the use of these equations has been studied with various brain-damaged populations, no studies have focused on a single type of brain damage such as aphasia. We studied the relationship between IQ scores obtained on the Kaufman Brief Intelligence Test (K-BIT), and estimated IQ scores using equations developed by Barona et al. (1984). A total of 20 non-brain-damaged (NBD) adults and 10 aphasic adults participated. For both groups the estimated scores were significantly correlated with K-BIT scores for performance IQ. For the NBD group the estimated scores were significantly correlated with Full Scale IQ but not Verbal IQ. Implications of these findings are discussed.