Table 5.

Fixed Effects for Risk Differences

RQ1: Follow-in Utterances → HSJE† vs. Follow-in Utterances → LSJE
	Coefficient	S.E.	95% CI
Group	−0.14	0.02	[−0.04, 0.02]
Sequence	0.01	0.01	[−0.18, 0.04]
Group × Sequence	0.02	0.02	[−0.02, 0.05]
CA	0.001	0.0004	[−0.002, 0.001]
Constant	0.02	0.01	[−0.01, 0.04]
RQ2: HSJE → Follow-in Utterances† vs. LSJE → Follow-in Utterances
	Coefficient	S.E.	95% CI
Group*	0.13	0.06	[0.01, 0.26]
Sequence	−0.01	0.06	[−0.12, 0.10]
Group × Sequence	−0.06	0.07	[0.20, 0.08]
CA	0.001	0.002	[−0.003, 0.004]
Constant	0.08	0.05	[−0.01, 0.18]
RQ3: Parent-focused → HSJE† vs. Follow-in Utterances → HSJE
	Coefficient	S.E.	95% CI
Group	−0.01	0.02	[0.04, 0.02]
Sequence*	0.03	0.01	[−0.0004, 0.06]
Group × Sequence	0.005	0.02	[−0.03, 0.04]
CA	0.00	0.0004	[−0.001, 0.001]
Constant	−0.003	0.01	[−0.03, 0.02]
RQ4: Follow-in Comments → HSJE† vs. Follow-in Directives → HSJE
	Coefficient	S.E.	95% CI
Group	−0.003	0.02	[-0.04, 0.03]
Sequence *	0.04	0.02	[0.01, 0.08]
Group × Sequence	−0.003	0.02	[−0.05, 0.04]
CA	0.00	0.001	[−0.001, .001]
Constant	0.002	0.02	[−0.03, 0.03]

^*p < .05

^†Sequence serving as the reference group. For all models, the typically developing group is the reference group for the Group variable.

Note: CA = Chronological Age, HSJE = Higher Order Supported Joint Engagement, LSJE = Lower Order Supported Joint Engagement