Table 4. Intraclass correlations (ICC) according to zygosity and estimates of genetic and environmental effects for the seven TCI [95% CI].

Dimension	Trait	MZ	DZ	A	C	E
		(n = 423 pairs)	(n = 408 pairs)	Additive Genetics	Common Environment	Unique Environment
TEMPERAMENT	Novelty Seeking	0.45	0.14	.44	.00	.56
		[.36–.52]	[.05–.24]	[.34–.51]	[.00–.07]	[.49–.64]
	Harm Avoidance	0.51	0.19	.50	.00	.50
		[.43–.57]	[.09–.28]	[.38–.56]	[.00–.09]	[.44–.57]
	Reward Dependence	0.45	0.30	.36	.11	.53
		[.38–.53]	[.21–.39]	[.14–.53]	[.00–.29]	[.46–.61]
	Persistence	0.56	0.11	.52	.00	.48
		[.49–.62]	[.01–.21]	[.45–.59]	[.00–.05]	[.41–.54]
CHARACTER	Self-directedness	0.52	0.36	.29	.22	.49
		[.44–.58]	[.27–.44]	[.09–.50]	[.04–.38]	[.43–.56]
	Cooperativeness	0.59	0.40	.38	.21	.41
		[.52–.65]	[.32–.48]	[.19–.57]	[.04–.37]	[.36–.47]
	Self-transcendence	0.51	0.31	.40	.11	.49
		[.43–.58]	[.22–.39]	[.19–.56]	[.00–.28]	[.43–.56]

Note: MZ = Monozygotic; DZ = Dizygotic (same-sex).