Table 2.

Twin Pearson Correlations for Log-Transformed Conduct Disorder and Adult Antisocial Behavior Symptom Counts

	Twin Correlations					Statistical Tests
Trait	MZ		DZ
	Male	Female	Male	Female	Opposite-Sex	MZ > DZ?	M < > F?	SSDZ > OSDZ?
Univariate Associations
Conduct Disorder	.44 [.36, .51]	.37 [.31, .43]	.33 [.24, .42]	.28 [.20, .36]	.15 [.07, .22]	Yes	yes	yes
Adult Antisocial Behavior	.34 [.25, .43]	.30 [.23, .38]	.25 [.13, .37]	.12 [.02, .22]	.08 [.00, .17]	Yes	yes	no
Bivariate Associations
Cross Trait Within Twin	.40 [.34, .46]	.36 [.30, .41]	.41 [.34, .48]	.32 [.25, .38]	.32 [.26, .37]	No	yes	no
Cross Trait Cross Twin	.33 [.26, .39]	.25 [.19, .31]	.21 [.13, .29]	.10 [.03, .18]	.06 [.00, .13]	Yes	yes	yes

Note. MZ = monozygotic. DZ = dizygotic. 95% confidence intervals are in brackets. Cross Trait Within Twin = The correlation between childhood conduct disorder and adult antisocial behavior for an individual (the stability of antisocial behavior across childhood and adulthood). Cross Trait Cross Twin = The correlation between one twin’s childhood conduct disorder and their co-twin’s adult antisocial behavior. MZ > DZ = are the MZ twin correlations significantly larger than the DZ twin correlations? M< > F = are the correlations for male-male twin pairs significantly different than the correlations for female-female twin pairs? SSDZ > OSDZ = are the correlations for same-sex dizygotic twin pairs significantly larger than the correlations for opposite-sex dizygotic twin pairs?