Table 3.

MZ twin and DZ/sibling correlations were estimated in the multivariate saturated model and proportion of variance and confidence intervals due to A and E, were estimated from best fitting multivariate model

	r MZ	r DZ/sib	A	E
Resting heart rate	0.70 (0.60–0.78)	0.49 (0.36–0.59)	0.68 (0.58–0.76)	0.32 (0.24–0.42)
HRR60	0.61 (0.49–0.70)	0.38 (0.23–0.51)	0.60 (0.48–0.67)	0.40 (0.31–052)
HRR180	0.67 (0.56–0.75)	0.40 (0.27–0.51)	0.65 (0.54–0.73)	0.35 (0.27–0.46)
Resting RSA	0.64 (0.53–0.73)	0.19 (0.04–0.32)	0.58 (0.45–0.69)	0.42 (0.31–0.55)
RSA60	0.35 (0.19–0.49)	0.22 (0.06–0.37)	0.23 (0.11–0.35)	0.77 (0.65–0.89)
RSA300	0.24 (0.08–0.40)	0.15 (–0.04–0.33)	0.03 (0.00–0.11)	0.97 (0.89–1.00)
EB	0.80 (0.73–0.85)	0.48 (0.35–0.59)	0.80 (0.73–0.85)	0.20 (0.15–0.27)