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. Author manuscript; available in PMC: 2020 Jan 1.

Published in final edited form as: Dev Psychol. 2018 Oct 25;55(1):9–22. doi: 10.1037/dev0000617

Table 4.

Hierarchical regression parameters for 16- and 22-month models, Study 1(N=44)

Final Model	Model 1				Model 2
Measure	R²	SE	β	p	R²	SE	β	p
	.22			.002	.42			<.001
Sex		.27	−.32	.022
MCDI production 16 months		.14	.38	.007
CCT comprehension 23 months						.13	.49	<.001
MCDI production 23 months						.13	.29	.032

Excluded Variables
Measure	B^a	t	p	B	t	p
Maternal Education	.13	.93	.358	.02	.19	.848
Sex				−.16	−1.37	.177
CCT comprehension 16 months	.17	1.19	.241
MCDI comprehension 16 months	−.16	−.89	.377

^a

Unstandardized B values. Note: Follow-up test on the effect of sex at 16 months was not significant (p=.05