. Author manuscript; available in PMC: 2023 Jan 4.

Published in final edited form as: Child Dev. 2021 Nov 11;93(1):e47–e58. doi: 10.1111/cdev.13675

TABLE 3.

Multilevel latent growth curve model results

Measure	b_1IB / $\bar{S}$	S on DOB	IQ on V
FSIQ	0.32 (0.03)^***	−0.01 (0.01)	−0.49 (0.04)^***
VIQ	0.28 (0.03)^***	−0.01 (0.01)	−0.33 (0.05)^***
PIQ	0.27 (0.04)^***	−0.01 (0.01)	−0.56 (0.05)^***

Note: Presented as estimate (SE).

Abbreviations: $\bar{S}$ , mean of the individual-level slopes; b_1IB and $\bar{S}$ were constrained to be equal; b_1IB, unstandardized regression of between-pair intercept (I) on date of birth; DOB, date of birth; FSIQ, full scale IQ; PIQ, performance IQ; S, between-pair slope; V, test version; VIQ, verbal IQ.

^***

p < .001.