Appendix 1—table 6. Results of the linear mixed-effect analyses (MM group only) for the amplitude and latency of each LAER component (P1, N1, P2, N2) where present, and for MMN and LDN amplitude for all children (cross-sectional study).

	Amplitude					Latency
Component	Effects	χ2	Df	p	R2m	Effects	χ2	Df	p	R2m
P1	BEPTA	0.76	1	.380	.055	BEPTA	.372	1	.541	.039
	Condition	7.89	2	.019	.101	Age band	.061	1	.804	.035
	BEPTA × Condition	6.48	2	.039	.044	BEPTA × Age band	2.94	1	.086	.034
N1	BEPTA	.32	1	.572	.009	BEPTA	6.00	2	.049	.126
						Condition	3.91	1	.047	.080
P2	BEPTA	2.14	1	.153	.091	Condition	4.72	2	.094	.037
N2	Age band	9.16	2	.010	.064	Condition	8.73	2	.013	.071
	Condition	4.80	1	.028	.069
MMN	Age Band	10.48	1	.001	.150
	BEPTA	8.45	1	.003	.115
LDN	Condition	2.24	2	.326	.004

Note. The best fitting models for LAER component amplitude and latency, and MMN amplitude were all an acceptable fit (Amplitude: P1 [AIC = 377.99, R²_c = .45], N1 [AIC = 185.16, R²_c = .24], P2 [AIC = 142.45, R²_c = .75], N2 [AIC = 480.39, R²_c = .43], MMN [AIC = 304.35, R²_c = .302] and LDN [AIC = 167.35, R²_c = .005]; Latency: P1 [AIC = 876.47, R²_c = .17], N1 [AIC = 357.94, R²_c = .23], P2 [AIC = 268.42, R²_c = .91], and N2 [AIC = 483.19, R²_c = .40]). Effects that were significant are shown in boldface.