Validity and reliability of the revised Neuropsychological Impairment Scale (NIS).

The revised Neuropsychological Impairment Scale (NIS) is a 95-item, self-reporting screening measure of neuropsychological symptoms. The present report examines the concurrent validity and test-retest stability of the NIS with a neurologically stable sample. The validation study found higher than chance correlations between the NIS and the validity battery and higher correlations with tests that are more sensitive to cognitive impairment. Results also suggest that patients may have more accurate awareness of certain areas of cognitive functioning (academic skills, speech/language functioning) than others (memory, attention, higher level problem-solving). High stability correlations over 2 to 3 months suggest that the NIS measures persisting characteristics rather than temporary states.