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aThe Differential Ability Scales, 2nd Edition (DAS-II) General Conceptual Ability score has a mean (SD) of 100 (15); a score of at least 85 is average, and less than 85 is below average, with higher scores indicating greater abilities. Invalid DAS-II scores include 20 examinations that were performed by a noncertified examiner and 33 with errors in administration involving incorrect start and stop points.
