The relationship between age and frequency of disfluency in preschool children

The frequencies of nine types of disfluency, including silent pauses, were studied in 60 nonstuttering males, 3.5 and 5 yr-of-age. The younger children evidenced significantly higher rates of part word, word, and phrase repetitions, incomplete phrases, and disrhythmic phonations. The older children demonstrated significantly more grammatical pauses. The two groups did not differ in the frequency of interjections, ungrammatical pauses, and revisions. The most powerful discriminating category between the two age groups was phrase repetition. The results are compared with findings from other recent investigations of disfluency in nonstuttering preschool males. Possible explanations for the discrepancies among the various investigations and for the high degree of variability in disfluency reported in the literature are proposed. The results of this investigation suggest that nonstuttering children begin to show more adult-like disfluency patterns toward the later preschool years.