Functional diagnosis | Approximate prevalence |
Developmental language delay (expressive, receptive, or mixed) | Preschool children: 10% Low-income children: As high as 30% |
Specific language impairment (expressive, receptive, or mixed) | School-age children: 6% |
Speech sound disorder/phonologic disorder (articulation disorder) | Children <5 years: 8 to 9% Children in first grade: 5% |
Fluency disorders/stuttering | Preschool children: 4 to 5% School-age and older children: 1% |
Autism spectrum disorders | Approximately 2.3% (1 in 44) |
Global developmental delay/intellectual disability | 1.5 to 3% |
Selective mutism (an anxiety disorder) | 0.7% |
Verbal apraxia | 0.1 to 0.2% |
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