Immediate and extended families of 66 stuttering children were investigated to determine frequencies of persistent and recovered stuttering. Recovery was far more common among females than males. Recovery or persistence was found to be transmitted, but the two types are not genetically independent, consistent with hypothesis that both forms share…

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)

Interviews with parents of 87 preschool children within a year of a stuttering diagnosis found that onset tended to occur earlier than was previously thought and was sudden and/or severe in many cases; about twice as many boys as girls stuttered; and there was a positive relationship between severe stuttering and sudden onset. (DB)