Table 1 Sex differences in finger measurements and 2D:4D ratios for both hands in total sample and European, African and Asian populations.

From: Sex, population origin, age and average digit length as predictors of digit ratio in three large world populations

Parameters	Population	Sex	N	Mean	SD	t	df	P	95% Confidence Interval of the Difference		Cohen’s d
Parameters	Population	Sex	N	Mean	SD	t	df	P	Lower	Upper	Cohen’s d
Right 2D finger	Total sample	Male	3760	67.365	7.702	13,163	7194	4.0423E−39	1.808	2.441	0.304
	Total sample	Female	3756	65.240	6.211
	European origin	Male	1445	70.650	6.544	11.935	2692	4.9027 E−32	2.126	2.962	0.437
	European origin	Female	1441	68.106	4.988
	African origin	Male	1511	65.287	7.718	7.883	2805	4.5512 E−15	1.583	2.632	0.297
	African origin	Female	1298	63.179	6.452
	Asian origin	Male	804	65.364	7.559	6.707	1498	2.8037 E−11	1.565	2.860	0.329
	Asian origin	Female	882	63.151	5.771
Right 4D finger	Total sample	Male	3757	70.145	7.716	21.667	7136	7.1268 E−101	3.164	3.794	0.500
	Total sample	Female	3755	66.666	6.109
	European origin	Male	1441	72.633	6.679	17.743	2662	1.1514 E−66	3.420	4.270	0.645
	European origin	Female	1575	68.788	5.019
	African origin	Male	1512	68.616	7.929	12.120	2806	5.4603 E−33	2.787	3.863	0.445
	African origin	Female	1298	65.291	6.616
	Asian origin	Male	804	68.562	7.887	10.670	1490	1.1501 E−25	2.989	4.335	0.524
	Asian origin	Female	882	64.900	5.969
Right average finger length	Total sample	Male	3740	68.728	7.593	17.536	7116	1.9764 E−67	2.468	3.090	0.405
	Total sample	Female	3750	65.949	6.032
	European origin	Male	1434	71.602	6.479	15.055	2641	3.3436 E−49	2.753	3.578	0.553
	European origin	Female	1573	68.437	4.847
	African origin	Male	1506	66.939	7.711	10.145	2798	8.9306 E−24	2.184	3.231	0.382
	African origin	Female	1297	64.231	6.419
	Asian origin	Male	800	66.946	6.646	8.738	1481	6.3183 E−18	2.257	3.564	0.430
	Asian origin	Female	880	64.035	5.775
Right 2D:4D ratio	Total sample	Male	3740	0.961	0.037	−21.755	7489	8.4128 E−102	−0.020	−0.017	0.493
	Total sample	Female	3751	0.979	0.036
	European origin	Male	1434	0.973	0.035	−13.743	2984	1.0206 E−41	−0.020	−0.015	0.514
	European origin	Female	1573	0.991	0.035
	African origin	Male	1506	0.952	0.038	−11.517	2801	5.0857 E−30	−0.019	−0.014	0.427
	African origin	Female	1297	0.968	0.037
	Asian origin	Male	800	0.954	0.032	−12.725	1679	1.772 E−35	−0.023	−0.017	0.635
	Asian origin	Female	881	0.974	0.031
Left 2D finger	Total sample	Male	3261	67.341	7.648	10.015	6284	1.9592 E−23	1.393	2.071	0.248
	Total sample	Female	3228	65.608	6.243
	European origin	Male	1167	70.043	6.784	9.533	2140	3.9689 E−21	1.846	2.802	0.389
	European origin	Female	1265	67.719	5.027
	African origin	Male	1301	66.038	7.638	2.557	2370	0.011	0.177	1.346	0.105
	African origin	Female	1086	65.276	6.907
	Asian origin	Male	806	65.531	7.768	7.506	1494	1.0407 E−13	1.872	3.197	0.368
	Asian origin	Female	884	62.997	5.882
Left 4D finger	Total sample	Male	3261	69.922	7.694	16.162	6266	1.3533 E−57	2.477	3.161	0.401
	Total sample	Female	3228	67.103	6.296
	European origin	Male	1162	71.999	6.985	13.572	2133	2.6265 E−40	2.921	3.908	0.555
	European origin	Female	1264	68.585	5.189
	African origin	Male	1294	68.706	7.834	5.284	2352	1.3838 E−7	1.027	2.240	0.217
	African origin	Female	1082	67.072	7.221
	Asian origin	Male	805	68.880	7.882	11.352	1293	1.0502 E−28	3.196	4.531	0.560
	Asian origin	Female	882	65.017	5.925
Left average finger length	Total sample	Male	3256	68.620	7.569	13.249	6245	1.5657 E−39	1.934	2.606	0.329
	Total sample	Female	3225	66.350	6.160
	European origin	Male	1159	71.006	6.777	11.724	2115	8.4438 E−31	2.378	3.333	0.480
	European origin	Female	1263	68.150	4.986
	African origin	Male	1293	67.361	7.631	4.013	2353	0.000062	0.615	1.790	0.167
	African origin	Female	1080	66.159	6.953
	Asian origin	Male	804	67.206	7.717	9.543	1487	5.4727 E−21	2.542	3.858	0.468
	Asian origin	female	882	64.006	5.819
Left 2D:4D ratio	Total sample	male	3256	0.963	0.036	−16.684	6471	3.1941 E−61	−0.016	−0.013	0.422
	Total sample	female	3225	0.978	0.035
	European origin	Male	1159	0.974	0.034	−10.649	2379	6.7029 E−26	−0.017	−0.012	0.418
	European origin	female	1263	0.988	0.033
	African origin	Male	1293	0.962	0.038	−7.816	2371	8.102 E−15	−0.015	−0.009	0.320
	African origin	female	1080	0.974	0.037
	Asian origin	Male	804	0.961	0.033	−11.414	1684	4.0782E−29	−0.021	−0.015	0.562
	Asian origin	female	882	0.969	0.031

Sex differences presented according to Student’s T test (t test statistics, SD std. deviation, df degrees of freedom, p statistical significance).

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Table 1 Sex differences in finger measurements and 2D:4D ratios for both hands in total sample and European, African and Asian populations.

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