Pipitone, who was not involved in the research, said the study's large sample size and measure of hormone levels strengthen its conclusions.
Research has suggested hormones, indeed, alter facial and vocal features.
The larynx, or voice box, has estrogen and progesterone receptors, and puberty, pregnancy, menopause, hormone replacement therapy and hormonal contraceptive use have all been shown to change women's voices, the study authors said.
The new research was published in the journal Hormones and Behavior.
