Speech samples of 50 adult male speakers were presented to 22 listeners, who estimated the age of each speaker and rated the adequacy, hoarseness, harshness, and breathiness of his voice. Five of the speakers were patients with cancer of the vocal folds, and five were individually matched normal speakers. It was found that the judgments of age, adequacy, and voice quality were reliable and that they differentiated the pathological and normal speakers. The relationships among chronological age and the judgments of age, adequacy, and voice quality were examined.
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Kreul et al. (1971) studied this question.