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KMID : 1036820180230030692
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Communication Sciences & Disorders
2018 Volume.23 No. 3 p.692 ~ p.702
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Developing Weighted Phonological Mean Length of Utterance and Testing the Validity
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Kim Min-Jung
Ha Seung-Hee
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Abstract
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Objectives: It is important to develop a speech measure which accurately and sensitively reflects speech production skills, and to test the validity of such a measure. This study aims to examine the validity of a new speech measure, weighted phonological mean length of utterance (PMLU-W) by comparing percent consonants correct (PCC) and phonological mean length of utterance (PMLU) from speech analyses of typically developing children and children with speech sound disorders (SSD).
Methods: The PCC, PMLU, and PMLU-W of 220 typically developing children and 18 children with SSD aged from 2;6 to 6;6 were derived from the Assessment of Phonology and Articulation for Children. PMLU-W was evaluated to examine whether it correlates with PCC and PMLU, and to see if it is sensitive to changes in speech development over time. Also, this study evaluated whether PMLU-W reflects phonological error patterns in children with SSD shows severe, moderate, or mild severity differently.
Results: The results showed that PMLU-W strongly correlates with PCC and PMLU, and sensitively captures normal speech development over time. PMLU-W better reflects the characteristics and nature of speech problems in children with SSD compared to the existing measures. In particular, PMLU-W is useful in distinguishing children with SSD who show syllable or phoneme deletions, vowel errors or atypical consonant substitutions.
Conclusion: This study found that PMLU-W would be a valid and sensitive measure of normal and disordered speech in children and be useful to quantify the characteristics and types of speech error patterns.
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KEYWORD
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Percent consonants correct, Phonological mean length of utterance, Weighted phonological mean length of utterance, Typically developing children, Speech sound disorder
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