This study quantifies connected speech samples of post-acute adults with mild, moderate and severe levels of aphasia. Yorkston and Beukelman (1980) established utterance production values for 50 adults with mild and moderate aphasic impairments. The present study reports mean and standard deviation syllable and utterance content values for severe impairments as well, based on the performance profiles of 103 adults with aphasia.
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Craig et al. (1993) studied this question.
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