Index-to-ring finger length ratio (2D:4D) predicts levels of salivary estradiol, but not progesterone, over the menstrual cycle.
We tested the association between the index-to-ring finger length ratio (2D:4D) and ovarian steroid hormone concentrations measured over the course of a menstrual cycle in the saliva of 38 young women. Estradiol levels were positively associated with right-hand, but not left-hand, 2D:4D, and also with the difference between right- and left-hand 2D:4D. None of these measures predicted progesterone level.
McIntyre
Matthew H
MH
Department of Anthropology, Harvard University, Cambridge, Massachusetts 02138, USA. mmcintyr@hsph.harvard.edu
Chapman
Judith Flynn
JF
Lipson
Susan F
SF
Ellison
Peter T
PT
D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D004958:Estradiol / Q000032:analysis*; D005260:Female; D005385:Fingers / Q000033:anatomy & histology*; D007839:Functional Laterality; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D010865:Pilot Projects; D011374:Progesterone / Q000032:analysis*; D013997:Time Factors
D011374:Progesterone; D004958:Estradiol