Abstract
Incidence and Sex Differences Estimates of the number of persons with speech disorders vary according to identification criteria and survey methods used. Figures also differ as a function of intelligence, emotional maturity, and physical status. A most valuable collection of incidence data was presented by Milisen (54), who found that approximately 12-15 percent of elementary and 4-5 percent of older school children had serious speech defects, mostly nonorganic articulatory errors. Stuttering and voice disorders each accounted for approximately 1 percent in addition. McCarthy (46) and Milisen (54) reported that boys tend to have more speech and language deficiencies than girls, the ratio varying from insignificant fractional differences in artic
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