A comparison of SAT achievement test scores of San Diego sixth-grade pupils attending special classes for IQ 140 or higher, with the scores of gifted children in ordinary classrooms. Twice as many gifted children were found as might be expected in an average population. There were five times the normal number having an IQ 140 and up, but an unexplained paucity having IQ's of 130-139. Of the special-class students, almost one-fourth were not under eighth-grade level in any subject; this was true of only one-twentieth of the other gifted children. Clearcut differences were found in the scores of pupils from different special classes. None of the gifted were under grade level in any subject--a change from 20 years ago, when the majority of pupils having IQ's over 160 were performing below average for their grade level.
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