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Phonetrograms increase in both sexes, except for a temporary decrease of dynamics and range between 13.5 and 14.5 years of age. The specific voice changes in both sexes depend on the sex hormonal level. Sex hormone binding globulin falls, predicting the drop of one octave of the fundamental frequency in boys. After menarche the expansion of the tonal range and the increasing level of estrogen sulphate predict the fundamental frequency change in girls. For both sexes the change of voice is measured maximally between 13.5 and 14.5 years of age.
KeywordsFundamental Frequency Testosterone Level Serum Testosterone Serum Testosterone Level Voice Change
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