Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)
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The incidence of stuttering refers to how many people have stuttered at some time in their lives. Although researchers have used different methodologies to gather these data, and since they have used slightly different definitions of stuttering, it is estimated that about 5% of the population have experienced periods of stuttering lasting longer than six months. Estimates of incidence, inclusive of children who may have evidenced period of stuttering lasting for only a short time period, are as high as 15%. (see prevalence).