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Subjects in grades 1-12 with phonologic disorders were identified and categorized into either Residual or Delayed groups. Group selection was based on a subject rating system of communicative defectiveness and number and type of phonologic errors. The subjects' performance was compared with that of normal individuals on a number of speech and language parameters. The results indicated that voice disorders, deficits in expressive language, and hearing problems occurred in persons exhibiting phonologic disorders with a higher frequency than in the normal individuals.
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Ruscello et al. (1991) studied this question.
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