. Author manuscript; available in PMC: 2023 Aug 1.

Published in final edited form as: J Psychopathol Clin Sci. 2022 Aug;131(6):626–640. doi: 10.1037/abn0000652

Table 6.

Monozygotic and Dizygotic Twin Intraclass Correlations and Univariate Genetic and Environmental Path Estimates for the Four RDoC Constructs

RDoC constructs	MZ ICC	DZ ICC	Parameters from fitting ACE model
	(261 pairs)	(399 pairs)	a	c	e
Reward Responsiveness	.760	.316	.856	.000	.517
Frustrative Nonreward	.620	.341	.779	.173	.602
Loss	.373	.203	.539	.256	.803
Fear	.511	.403	.444	.553	.705

Note. ACE values are standardized, unsquared estimates, which can be squared for variance estimates. Bolded estimates are significantly different from 0. Sex and age were regressed out of scores before ICCs were calculated; thus, both same-sex and opposite-sex pairs are included in the DZ column.