Table 3.

Phenotypic and Twin Correlations Between the Two Child Psychopathy Scale Factors and Reactive and Proactive Aggression (Twin Self-Reports)

Phenotypic correlations
	Callous & disinhibited			Manipulative & deceitful
Reactive aggression	.45*			.39*
Proactive aggression	.46*			.46*
	Intraclass and cross-twin cross-trait correlations
	Callous & disinhibited	Manipulative & deceitful	Reactive aggression	Proactive aggression
MZ male
Callous & disinhibited	.39*	.36*	.31*	.38*
Manipulative & deceitful		.42*	.21*	.38*
Reactive aggression			.39*	.49*
Proactive aggression				.46*
DZ male
Callous & disinhibited	.17	.58*	.48*	.59*
Manipulative & deceitful		.11	.35*	.58*
Reactive aggression			.28*	.56*
Proactive aggression				.26*
MZ female
Callous & disinhibited	.34*	.37*	.38*	.45*
Manipulative & deceitful		.25*	.28*	.37*
Reactive aggression			.35*	.47*
Proactive aggression				.12
DZ female
Callous & disinhibited	.08	.39*	.42*	.33*
Manipulative & deceitful		.23*	.47*	.52*
Reactive aggression			.40*	.47*
Proactive aggression				.17
DZ OS
Callous & disinhibited	.13	.52*	.46*	.42*
Manipulative & deceitful		.04	.43*	.46*
Reactive aggression			.06	.57*
Proactive aggression				.11

Note. Intraclass twin correlations are underlined. Twin correlations for reactive and proactive aggression have been reported on these data (see Baker, Raine, Liu, & Jacobson, 2008). DZ = dizygotic; MZ = monozygotic; OS = DZ opposite sex.

^*p < .05.