Table 3.

Cross-Twin Correlations Monozygotic and Dizygotic Twin Pairs.

	Twin 2
	Monozygotic			Dizygotic
Phenotype	1.	2.	3.	1.	2.	3.
Twin 1
1. Developmental language disorder (Ch.)	.69 [.53, .81]	—	—	.58 [.43, .70]	—	—
2. Internalizing problems (Ch.)	.21 [.11, .31]	.68 [.61, .74]	—	.06 [−.03, .15]	.34 [.26, .43]	—
3. Internalizing problems (Ad.)	.11 [−.01, .22]	.32 [.25, .40]	.74 [.67, .79]	.10 [−.01, .21]	.19 [.11, .26]	.40 [.30, .50]
1. Developmental language disorder (Ch.)	.69 [.53, .81]	—	—	.58 [.43, .70]	—	—
2. Externalizing problems (Ch.)	.18 [.08, .29]	.64 [.55, .71]	—	.10 [.01, .19]	.16 [.07, .25]	—
3. Externalizing problems (Ad.)	.20 [.09, .31]	.35 [.28, .43]	.77 [.71, .82]	.15 [.04, .25]	.20 [.12, .28]	.38 [.28, .47]

Note. Values represent correlation coefficients [95% confidence intervals]. Bold values indicate that the 95% confidence intervals did not cross zero. Monozygotic and dizygotic indicate separate cross-twin correlations for monozygotic and dizygotic twin pairs (Twins 1 and 2), respectively. Ch. = childhood, Ad. = adolescence.