Table 6.

Estimates of genetic and environmental variances and genetic and environmental correlations (and 95% confidence intervals) from full- and best-fitting models

Model	Variance components									Covariances
	Orientation/engagement			Autistic-like behavior
				Common			Unique
	a 2	c 2	e 2	a 2	c 2	e 2	a 2	c 2	e 2	r g	r c	r e
Full	0.26 (0.06; 0.46)	0.13 (0.01; 0.30)	0.61 (0.50; 0.73)	0.38 (0.14; 59)	0.21 (0.04; 0.40)	0.01 (0.00; 0.03)	0.00 (−0.43; 0.43)	0.00 (−0.34; 0.34)	0.40 (0.32; 0.51)	−1.0 (−1.0; −0.39)	1.0 (0.07; 1.0)	−0.12 (−0.26; 0.01)
Reduced	0.30 (0.14; 0.45)	0.11 (0.02; 0.25)	0.59 (0.49; 0.70)	0.39 (0.19; 0.58)	0.21 (0.05; 0.38)	–	0.00 (−0.30; 0.30)	0.00 (−0.30; 0.30)	0.40 (0.30; 0.50)	−1.0 (−1.0; −0.62)	1.0 (0.23; 1.0)	–

a² genetic variance, c² shared environmental variance, e² nonshared environmental variance, r_g genetic correlation, r_c shared environmental correlation, r_e nonshared environmental correlation