. Author manuscript; available in PMC: 2014 Feb 3.

Published in final edited form as: Dent 3000. 2013;1(1):14. doi: 10.5195/d3000.2013.14

Table 1.

Intraclass correlation coefficients (ICC) and G estimates for principal components showing evidence of high heritability.

Shape Component	Variation Explained	ICC_MZ	ICC_DZ	G^a
PC4	6.8%	0.783^*	0.013	1.0^b
PC5	5.7%	0.771^*	0.314	0.9
PC7	4.0%	0.675^*	0.284	1.0^b

p < 0.05 for test of within group non-zero ICC

G = 2(ICC_MZ − ICC_DZ)

Heritability estimate capped at 1.0