. Author manuscript; available in PMC: 2011 Jun 1.

Published in final edited form as: Physiol Behav. 2010 Jan 21;100(3):221–224. doi: 10.1016/j.physbeh.2010.01.005

Table 1.

Mean of ratios of finger bone lengths (95% CL), for the 2^nd to 4^th digits (2D:4D), by sex and Cohen’s D (SD) for the difference between sexes.

Digit ratio	Phalanges	Metacarpal	Sum
Boys (n=75)	0.923 (0.918–0.929)	1.192 (1.184–1.200)	1.028 (1.023–1.033)
Girls (n=6)	0.910 (0.877–0.943)	1.170 (1.137–1.203)	1.013 (0.986–1.041)
Cohen’s D (SD)	0.514 (0.025)	0.620 (0.035)	0.662 (0.022)

NOTE: No statistically significant differences (P>0.05) between boys and girls.

CL, confidence limits; SD, pooled standard deviation; Sum, sum of lengths of the metacarpal and phalanges.