WISC subtest scores from two populations of disabled readers were factor analyzed. Subtests included in Bannatyne's Spatial and Conceptual categories were each found to comprise separate factors. Subtests in Bannatyne's Sequential category, particularly Digit Span and Coding, comprised a separate factor in only one of the two populations. This suggests that the lowered scores of disabled readers on Digit Span and Coding cannot be accounted for in terms of a single underlying short-term memory ability.
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