Stuttering in individuals with Down syndrome: a systematic review of earlier research

This systematic review synthesized evidence from 14 studies (1,833 participants aged 3-58 years) on stuttering occurrence in Down syndrome, finding prevalence rates of 2.38-56%, substantially higher than the 1% in the general population. Most individuals displayed mild-to-moderate stuttering severity with secondary behaviors, though research gaps remain in comprehensive characterization of this communication disorder in this population.