Table 6.

Linear model parameter estimates for dyadic synchrony and responsiveness by outcome

	Dyadic Synchrony		Infant Responsiveness		Maternal Responsiveness
Fixed Effects	Estimate (SE)	t	Estimate (SE)	t	Estimate (SE)	t
Outcome Groupa	−9.24(8.4)	−1.10	−6.51(3.1)	−2.08*	−1.35(4.3)	−0.31
Visit	0.50(2.4)	0.21	−0.92(0.9)	−1.03	1.10(1.2)	0.90
Group x Visit	1.18(0.9)	1.34	0.78(0.3)	2.38*	0.26(0.5)	0.59
Infant Sexb	3.48(3.0)	1.17	1.62(1.1)	1.49	2.87(1.6)	1.74
Maternal Education (yrs)	1.13(0.6)	1.77	0.60(0.2)	2.58*	0.20(0.4)	0.56
Estimated Marginal Meansc
Group x 6M Visit
ASD x Non-TD			2.51(4.0)	0.63
ASD x TD			2.43(3.2)	0.77
Non-TD x TD			−0.08(2.9)	−0.03
Group x 9M Visit
ASD x Non-TD			4.75(3.5)	1.36
ASD x TD			2.43(2.7)	0.91
Non-TD x TD			−2.32(2.7)	−0.87
Group x 12M Visit
ASD x Non-TD			1.83(3.6)	0.51
ASD x TD			−5.14(2.8)	−1.81
Non-TD x TD			−6.97(2.6)	−2.71*

Note:

^aCoded as ASD = 1; Non-TD = 2; TD = 3.

^bDichotomized as Male = 1; Female = 0.

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

^*p values < .05