Table 4.

Correlations estimated from the most parsimonious model

	Zygosity	Twin correlation		Mother–father cross-correlations	Parental agreement
		Mo	Fa		Phenotypic correlation	Genetic correlation
Anxious/depressed	MZ	0.73	0.75	0.48	0.66	0.87
	DZ	0.46	0.47	0.26
Withdrawn/depressed	MZ	0.73	0.75	0.46	0.62	0.72
	DZ	0.37	0.41	0.18
Somatic complaints	MZ	0.70	0.71	0.45	0.66	0.78
	DZ	0.45	0.42	0.24
Rule-breaking behavior	MZ	0.89	0.90	0.56	0.63	0.74
	DZ	0.69	0.69	0.41
Aggressive behavior	MZ	0.87	0.89	0.64	0.72	0.86
	DZ	0.58	0.61	0.40
Social problems	MZ	0.79	0.83	0.54	0.67	0.77
	DZ	0.50	0.54	0.32
Thought problems	MZ	0.79	0.82	0.52	0.64	0.68
	DZ	0.48	0.49	0.30
Attention problems	MZ	0.79	0.81	0.59	0.74	0.42/1.0/0.74a
	DZ	0.29	0.32	0.17
INT	MZ	0.75	0.77	0.51	0.65	0.89
	DZ	0.55	0.53	0.32
EXT	MZ	0.89	0.89	0.64	0.72	0.82
	DZ	0.62	0.65	0.43
Dysregulation profile	MZ	0.87	0.88	0.64	0.72	0.89
	DZ	0.60	0.64	0.42
Total problems	MZ	0.89	0.90	0.66	0.73	0.90
	DZ	0.69	0.72	0.49

^aFor attention problems both the additive genetic correlation, the correlation between genetic dominance factors and the total genetic correlation (the correlation between the summed additive and dominant genetic effects) are given