Table 2.

Results of linear mixed effects models predicting social contact with peers and vocalizations to peers.

		Fixed effects				Random effects		Chi-square test of model fit
Model Outcome	Model Parameter	B	SE	t	95% CI	Variance	SD	X 2	df	p
Proportion of time in social contact with individual peers	Target hearing status	.01	.004	2.30	.001, .02	___	___	1.87	1	.172
	Peer hearing status	.01	.002	4.76	.007, .02	___	___	11.87	1	.0006
	Activity type	−.03	.002	−18.31	−.04, −.03	___	___	321.31	1	<.00001
	Interaction between target hearing status and peer hearing status	.02	.005	3.41	.007, .03	___	___	11.63	1	.0006
	Random subject intercept	___	___	___	___	.00008	.009	83.41	1	<.00001
	Random cohort intercept	___	___	___	___	.00007	.009	6.41	1	.011
Target vocalizations	Target hearing status	7.06	2.49	2.84	2.10, 12.01	___	___	4.62	1	.032
	Peer hearing status	5.34	.82	6.56	3.75, 6.94	___	___	28.79	1	<.00001
	Activity type	−8.70	.60	−14.40	−9.89, −7.52	___	___	201.83	1	<.00001
	Interaction between target and peer hearing status	6.10	1.63	3.74	2.91, 9.30	___	___	14.00	1	.0002
	Random subject intercept	___	___	___	___	31.79	5.64	262.75	1	<.00001
	Random cohort intercept	___	___	___	___	17.30	4.16	3.78	1	.052

Note. Target child’s and peer’s hearing status were coded categorically as hearing loss versus typical hearing. Positive values indicate a typical hearing advantage. Activity type was coded as free-play versus other activities (negative values indicate a free-play disadvantage).