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Percentage of participants in six childhood apraxia of speech (CAS), complex neurodevelopmental disorders (CND), and adult-onset apraxia of speech (AAS) cohorts whose CAS was classified as mild, mild-moderate, moderate-severe, or severe on the basis of the pause marker index (PMI). CASI = CAS-idiopathic; CASN = CAS-neurogenetic; AOS = apraxia of speech; PPAOS = primary progressive AOS.
