High testosterone levels predict low voice pitch among men. Dabbs, J M and Mallinger, A Personality and Individual Differences, 27(4):801-804.
doi  abstract   bibtex   
We measured salivary testosterone levels and voice pitch, or fundamental frequency,among 61 male and 88 female college students. Higher levels of testosterone were significantlyassociated with lower pitched voices among males but not among females. The magnitude of theeffect was approximately the same as the magnitude of other relationships that have beenreported between testosterone and behavior. There are two plausible explanations of a linkbetween testosterone and pitch. One explanation is physiological, in which testosterone changes the bulk, length, or tension of the vocal folds. The other is psychological, in which testosteroneaffects the vocal style that an individual uses as part of a social interaction strategy.
@article{dabbs_high_1999,
	Author = {Dabbs, J M and Mallinger, A},
	Date = {1999},
	Date-Modified = {2017-04-19 08:04:06 +0000},
	Doi = {10.1016/S0191-8869(98)00272-4},
	File = {Attachment:files/2719/Dabbs, Mallinger - 1999 - High testosterone levels predict low voice pitch among men.pdf:application/pdf},
	Journal = {Personality and Individual Differences},
	Keywords = {f0, gender, interspeaker variation, phonation, phonetics, prosody},
	Number = {4},
	Pages = {801-804},
	Title = {High testosterone levels predict low voice pitch among men},
	Volume = {27},
	Abstract = {We measured salivary testosterone levels and voice pitch, or fundamental frequency,among 61 male and 88 female college students. Higher levels of testosterone were significantlyassociated with lower pitched voices among males but not among females. The magnitude of theeffect was approximately the same as the magnitude of other relationships that have beenreported between testosterone and behavior. There are two plausible explanations of a linkbetween testosterone and pitch. One explanation is physiological, in which testosterone changes the bulk, length, or tension of the vocal folds. The other is psychological, in which testosteroneaffects the vocal style that an individual uses as part of a social interaction strategy.},
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