Table 3.

Separate Participant and Companion Analysis Results

Variable	Model	Group Effect	AICc	dAICc	wAICc
Participant total	1	Null	315.15	25.15	0.00
	2	Baseline	290.45	0.45	0.44
	3	Baseline + Longitudinal	290.00	0.00	0.56
Participant memory	1	Null	1762.95	12.54	0.00
	2	Baseline	1750.41	0.00	0.84
	3	Baseline + Longitudinal	1753.69	3.28	0.16
Participant language	1	Null	1111.01	42.07	0.00
	2	Baseline	1068.94	0.00	0.82
	3	Baseline + Longitudinal	1071.91	2.97	0.18
Participant vsp. perception	1	Null	218.20	11.00	0.00
	2	Baseline	208.58	1.37	0.33
	3	Baseline + Longitudinal	207.20	0.00	0.66
Participant exe. function	1	Null	955.42	19.38	0.00
	2	Baseline	936.04	0.00	0.87
	3	Baseline + Longitudinal	939.82	3.78	0.13
Companion total	1	Null	304.96	51.53	0.00
	2	Baseline	255.19	1.76	0.29
	3	Baseline + Longitudinal	253.43	0.00	0.71
Companion memory	1	Null	1186.47	34.75	0.00
	2	Baseline	1153.23	1.51	0.32
	3	Baseline + Longitudinal	1151.72	0.00	0.68
Companion language	1	Null	467.38	53.52	0.00
	2	Baseline	413.86	0.00	0.73
	3	Baseline + Longitudinal	415.86	2.00	0.27
Companion vsp. perception	1	Null	253.40	18.52	0.00
	2	Baseline	234.89	0.00	0.70
	3	Baseline + Longitudinal	236.58	1.70	0.30
Companion exe. function	1	Null	1255.49	47.06	0.00
	2	Baseline	1210.34	1.91	0.28
	3	Baseline + Longitudinal	1208.43	0.00	0.72

Note. AICc = Akaike’s information criterion corrected for sample size; dAICc = difference in AICc; wAICc = AICc weight; Vsp. perception = visuospatial perception; Exe. function = executive function.

The models with smallest AICc values are the best models and are displayed in boldface type. Models with smaller dAICc and wAICc closest to 1 indicate better fit.