上一個post 講咗Motor Speech Disorders (MSD) 嘅新分類，接住落嚟就要講下Prevalence 喇。Shriberg, Kwiatkowski, & Mabie (2019) 報告咗MSD喺idiopathic Speech Delay (SD)入面嘅prevalence。要注意，MSD 唔一定只係idiopathic SD入面搵到，有一啲Complex Neurodevelopmental Disorders (例如 Down syndrome, fragile X syndrome, Galactosemia 等)都會有。呢篇文章只注視idiopathic SD，另外有一啲文章係注視一啲complex neurodevelopmental disorders 嘅 (e.g., Baylis & Shriberg, 2018; Shriberg, Strand, Jakielski, & Mabie, 2019).
研究搵咗415 有idiopathic SD 嘅小朋友，同佢地進行motor speech assessment，然後將佢地分類。數字如圖一。
之後，再進行估算一下prevalence，結果在圖二。
結論： 1) SMD 相對地係較CAS同CD為多。 2) 雖然CD&CAS 係數字上面係0, 但研究人員都認為係有啲種情況嘅。事實上，喺一啲研究報告入面都有提及呢類嘅情況 (e.g., Murray et al., 2015)。 3) CAS 嘅prevalence 同之前嘅研究類似(Shriberg et al., 1997)。
個人意見： 1) 可能你會覺得知道一個數字對於臨床工作沒有太大的影響，但我就覺得數字俾到一啲槪念前線工作嘅治療師，亦可方便與家長溝通。 2) 呢啲數字對於寫research fund 嘅proposal 好重要。無funding嘅support，好多研究都做唔成，呢個係事實。
Reference: Baylis, A. L., & Shriberg, L. D. (2018). Estimates of the prevalence of speech and motor speech disorders in youth with 22q11.2 Deletion syndrome. American Journal of Speech-Language Pathology. Advance online publication. doi: 10.1044/2018_AJSLP-18-0037.
Murray, E., McCabe, P., Heard, R. & Ballard, K. J. (2015). Differential diagnosis of children with suspected childhood apraxia of speech. Journal of Speech, Language and Hearing Research, 58(1), 43-60.
Shriberg, L. D., Aram, D., & Kwiatkowski, J. (1997). Developmental apraxia of speech: I. Descriptive and theoretical perspectives. Journal of Speech, Language, and Hearing Research, 40, 273–285.
Shriberg, L. D., Kwiatkowski, J. & Mabie, H. L. (2019). Estimates of the prevalence of motor speech disorders in children with idiopathic speech delay. Clinical Linguistics & Phonetics. DOI: 10.1080/02699206.2019.1595731
Shriberg, L. D., Strand, E. A., Jakielski, K. J., & Mabie, H. L. (2019). Estimates of the prevalence of speech and motor speech disorders in persons with complex neurodevelopmental disorders. Clinical Linguistics & Phonetics.
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