Sex Differences in Human Voice Pitch:

The difference between male and female means (in pooled standard deviations, Cohen’s d) for voice pitch (measured by fundamental frequency -> F0) and other putative targets of sexual selection.
A sample of 630 US university undergraduate students. (D. A. Puts, unpublished data)


Source:
Evolutionary Perspectives on Human Sexual Psychology and Behavior
V. A. Weekes-Shackelford et al. (2014) -> D.A. Puts, L. M. Doll, A. K. Hill