Table 5.

Linear model parameter estimates for dyadic synchrony and responsiveness by risk status

	Dyadic Synchrony		Infant Responsiveness		Maternal Responsiveness
Fixed Effects	Estimate (SE)	t	Estimate (SE)	t	Estimate (SE)	t
Risk Groupa	5.77(10.5)	0.55	4.51(4.0)	1.13	−3.02(5.4)	−0.56
Visit	4.64(0.8)	5.61**	1.66(0.3)	5.31**	1.92(0.4)	4.57**
Group x Visit	−1.22(1.1)	−1.11	−0.72(0.4)	−1.73	0.03(0.6)	0.06
Infant Sexb	3.25(2.7)	1.19	1.38(1.0)	1.34	2.74(1.5)	1.86
Maternal Education (yrs)	0.79(0.6)	1.34	0.36(0.2)	1.61	0.18(0.3)	0.57
Estimated Marginal Meansc
Group x 6M Visit	2.06(5.1)	0.41	0.10(1.9)	0.05	3.40(2.6)	1.29
Group x 9M Visit	4.42(4.3)	1.02	1.51(1.6)	0.92	1.83(2.3)	0.81
Group x 12M Visit	9.26(4.4)	2.11*	4.39(1.7)	2.64*	3.11(2.3)	1.36

Note:

^aDichotomized as High-risk = 1; Low-risk = 0.

^bDichotomized as Male = 1; Female = 0.

^cSeparate models were specified for marginal means treating visit as a categorical variable to identify when age differences emerged.

^*p values < .05

^**p values < .001