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

Published in final edited form as: J Pediatr. 2018 Apr 24;199:49–56.e1. doi: 10.1016/j.jpeds.2018.03.002

Table 4.

Multi-level model Results: Predictors of StimQ z-scores 6–54 months

	Unstandardized Confidence	95% Coefficients Interval	p
StimQ Read
Main effects model^a
VIP	0.303	0.146 – 0.461	<.001
Age	0.000	−0.002 – 0.003	0.78
Interaction model^b
VIP × Age	−0.0002	−0.005 – 0.004	0.9
Moderation models^c
VIP × Maternal Lit/Education	0.011	−0.341 – 0.363	0.95
VIP × Social Risk	0.072	−0.268 – 0.411	0.68
StimQ PIDA
Main effects model^a
VIP	0.196	0.057 – 0.334	0.01
Age	0.000	−0.003 – 0.003	0.84
Interaction model^b
VIP × age	−0.004	−0.010 – 0.001	0.11
Moderation models^c
VIP × Maternal Lit/Education	0.192	−0.117 – 0.501	0.22
VIP × Social Risk	0.069	−0.138 – 0.275	0.51
StimQ Parent Verbal Responsivity
Main effects model^a
VIP	0.384	0.227 – 0.541	<.001
Age	−0.001	−0.004 – 0.001	0.35
Interaction model^b
VIP × age	−0.003	−0.008 – 0.001	0.14
Moderation models^c
VIP × Maternal Lit/Education	0.05	−0.301 – 0.401	0.78
VIP × Social Risk	−0.04	−0.274 – 0.195	0.74
StimQ Availability of Learning Materials
Main effects model^a
VIP	0.174	0.017 – 0.331	0.03
Age	−0.00001	−0.003 – 0.003	0.99
Interaction model^b
VIP × age	−0.006	−0.010 – −0.001	0.01
Moderation models^c
VIP × Maternal Lit/Education	−0.111	−0.463 – 0.241	0.54
VIP × Social Risk	0.045	−0.191 – 0.280	0.71
StimQ Total
Main effects model^a
VIP	0.375	0.211 – 0.540	<.001
Age	−0.0002	−0.002 – 0.003	0.84
Interaction model^b
VIP × age	−0.004	−0.008 – 0.000	0.05
Moderation models^c
VIP × Maternal Lit/Education	0.048	−0.320 – 0.417	0.80
VIP × Social Risk	0.016	−0.230 – 0.262	0.90

Adjusts for child gender, child age, maternal literacy/education, and 3–5 at 54 months. Coefficients for VIP represent the difference in z scores for VIP compared to control across the 6 – 54-month period.

Includes all predictors from Main effects model in addition to listed interaction terms. Coefficients represent difference in slope between 6 and 54 months for VIP compared to control.

Two separate models including all predictors from Main effects model in addition to listed interaction terms. Coefficients represent the difference in VIP impact for different levels of maternal literacy/education and social risk.