Table II.

Polychoric Cross‐Rater Correlations for Boys and Girls Within MZ and DZ Twins, Polychoric Twin Correlations of the Maternal (M) and Paternal (P) Ratings, and Cross‐Twin‐Cross‐Rater Correlations for the DSM‐Oriented CBCL Scales

	Affective		Anxiety		Somatic		ADHD		Oppositional defiant		Conduct		Obsessive‐compulsive
Cross‐rater	Boys	Girls	Boys	Girls	Boys	Girls	Boys	Girls	Boys	Girls	Boys	Girls	Boys	Girls
MZ	0.66	0.67	0.66	0.64	0.68	0.66	0.75	0.72	0.74	0.69	0.67	0.61	0.62	0.62
DZ	0.66	0.64	0.64	0.65	0.68	0.67	0.74	0.73	0.70	0.67	0.68	0.63	0.64	0.60

	M	P	M	P	M	P	M	P	M	P	M	P	M	P
Twin correlations
MZm	0.80	0.82	0.74	0.77	0.71	0.73	0.82	0.79	0.84	0.88	0.88	0.91	0.68	0.74
DZm	0.47	0.49	0.39	0.42	0.44	0.38	0.26	0.26	0.55	0.55	0.67	0.66	0.40	0.37
MZf	0.80	0.80	0.75	0.80	0.74	0.74	0.80	0.81	0.82	0.84	0.87	0.88	0.67	0.70
DZf	0.48	0.49	0.40	0.48	0.48	0.40	0.23	0.25	0.54	0.57	0.68	0.70	0.32	0.33
DOS	0.50	0.50	0.46	0.49	0.45	0.44	0.27	0.34	0.55	0.54	0.63	0.66	0.40	0.39
Cross‐twin cross‐rater
MZm	0.54		0.49		0.47		0.62		0.65		0.60		0.44
DZm	0.30		0.23		0.22		0.14		0.35		0.43		0.19
MZf	0.53		0.49		0.46		0.59		0.58		0.54		0.40
DZf	0.31		0.25		0.21		0.08		0.33		0.40		0.12
DOS	0.31		0.27		0.25		0.17		0.33		0.41		0.20

ADHD: attention deficit/hyperactivity disorder.