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. 2011 Jul 25;14(1):11–18. doi: 10.2478/v10034-011-0012-5

Table 2.

Differences in prevalence of homozygous recessive traits between male and female subjects

	Males/Females
HRT (χ2)	Controls (%)	SBO (%)	SBA (%)
Blond hair	0	0.1	0
Straight hair	0.5	0.5	6.7^a
Two hair whorls	0.3	2	0.1
Opposite hair whorl orientation	10.7^a	39.0^a	4.4^b
Soft hair	2.6	0.4	14.4^a
Continuous hairline	4.9^b	4.9^b	14.5^a
Attached ear lobe	2.5	4.0^b	15.1^a
Ear without the Darwinian notch	2	0.2	31.9^a
Blue eyes	0.1	1.7	8.4^a
Color blindness	2.6	0.1	4.4^a
Right thumb over left thumb	0.6	1.8	10.8^a
Top joint of the thumb >45°	2.1	8.7^a	6.8^a
Proximal thumb extensibility	3.1	0.4	27.0^a
Left handedness	6.9^a	0.2	0.8
Index finger longer than the ring finger	7.4^a	2.9	20.6^a
∑χ2	46.3^a	66.9^a	165.9^a

^a

p <0.01.

^b

p <0.05.