Validation of the Norwegian version of Hayes Ability Screening Index for mental retardation

The Hayes Ability Screening Index was developed primarily to provide a short, effective screening test to indicate possible mental retardation amongst persons who come in contact with the criminal justice system. This study examined the validity of a Norwegian version in a sample of 73 subjects. 45 were male and 28 were female (M = 33.3 yr, SD = 12.5; range = 17 to 60 years) consecutively selected from patients referred for neuropsychological examination. The Wechsler Adult Intelligence Scale (WAIS-III) was the criterion of validity. The correlation of .81 between scores on the WAIS-III and the Hayes Index was significant. At a stated cut-off score of 85, the sensitivity was 100% and specificity 57%. A suggested alternative cut-off score of 81 obtained a sensitivity of 95% and specificity of 72%. These results indicate that the Hayes Ability Screening Index is a useful, valid, and time-saving tool for screening of mental retardation for the Norwegian population.