. Author manuscript; available in PMC: 2019 Jul 1.

Published in final edited form as: Behav Genet. 2018 Apr 20;48(4):298–314. doi: 10.1007/s10519-018-9900-8

Table IV.

Phenotypic and Twin Correlations (MZ/DZ) For Latent Growth Factors

Growth Factors	Intercept	Slope
Teacher Ratings
Internalizing
Intercept	1.0^^a/.33^	−.24
Slope	−.59^*/−.02	.91^*/−.03
Externalizing
Intercept	.98^/.52^	−.42^*
Slope	−.36^*/−.18	.49/.29
Parent Ratings
Internalizing
Intercept	.95^/.37^	−.16
Slope	−.26/.27	.80^*/.41
Externalizing
Intercept	.83^/.52^	−.15
Slope	.03/.02	.43^/.43^

Note. Partial correlations, controlling for sex. Correlations on the diagonal and in the lower diagonal are cross-twin correlations (MZ on left/DZ on right); those in the upper diagonal are phenotypic correlations (within-individual Intercept-Slope). Correlations taken from a model in which within-twin parameters were constrained to equality across twins and zygosity groups. MZ = monozygotic, DZ = dizygotic.

Correlation was estimated at slightly over 1.0 (1.06), so was bound at 1.0.

p<.05.