Data on the onset of stuttering in 22 children two and three years of age were obtained through systematic parent interviews using a coded questionnaire. All children were reported to have begun stuttering prior to 36 months of age. (Author)

This study of 20 stuttering and 20 nonstuttering preschool children found that stuttering children scored lower on 7 out of 8 language measures, with no significant intergroup differences on articulation proficiency or fluency. There were few significant correlations between measures of stuttering rate, speaking rate, and language performance…

Preliminary to a survey of a national sample of 40,000 subjects intended to estimate prevalence of speech and hearing disorders in the United States public school population, a mobile unit collected data on a pilot sample of subjects in grades 1 through 12. Speech testing of 6,290 subjects indicated about 85% had articulation which did not deviate…