The WISC and WISC-R were administered on occasions 2 yr. apart to 186 children with learning difficulties. Ages ranged from 6 to 13 yr. initially and from 8 through 15 yr. at second testing. Pearson correlations ranged from .85 between the WISC and WISC-R Full Scale IQs at Age 9 to .96 at Ages 8, 14, and 15. No significant differences were noted between the sets of Full Scale IQs.
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