Table 2.

Linear regression models of ERP components vs social communication measures

	MSEL Expressive		MSEL Receptive		Phrases Understood		Early Gestures		ADOS Social score		CSBS Social score
Model	1	2	1	2	1	2	1	2	1	2	1	2
Nc
Adjusted R2	0.11	0.11	0.09	0.10	0.15	0.15	0.26	0.29	0.24	0.30	− 0.04	− 0.06
Variables [B coefficient (SE)]
Intercept	50.41 (2.67)	51.56 (2.71)	41.68 (2.74)	42.41 (2.77)	8.60 (2.53)	8.20 (2.78)	8.97 (1.33)	9.26 (1.44)	2.45 (0.98)	2.07 (0.96)	8.93 (4.70)	9.59 (4.85)
Mother-Stranger Response	0.90 (0.29)**	1.15 (0.41)**	0.38 (0.29)	0.63 (0.42)	0.42 (0.23)	0.21 (0.38)	0.22 (0.12)	0.22 (0.20)	− 0.01 (0.11)	− 0.01 (0.17)	0.51 (0.54)	0.83 (0.80)
Maternal Education	− 0.32 (1.38)	− 0.71 (1.41)	2.36 (1.42)	1.92 (1.44)	2.23 (1.35)	2.42 (1.46)	1.20 (0.71)	1.03 (0.77)	− 0.14 (0.50)	0.09 (0.49)	− 0.50 (2.49)	− 0.97 (2.61)
Group
HR-NoASD	− 2.92 (2.06)	− 3.08 (2.07)	1.07 (2.12)	0.89 (2.11)	− 3.00 (1.74)	− 2.90 (1.74)	− 2.01 (0.91)*	− 1.98 (0.90)*	0.56 (0.77)	0.66 (0.74)	2.16 (3.47)	2.29 (3.52)
HR-ASD	− 5.57 (2.68)**	− 5.89 (2.69)*	− 5.42 (2.75)	− 5.81 (2.75)*	− 4.57 (2.14)*	− 5.19 (2.22)*	− 4.04 (1.13)**	− 4.62 (1.15)**	4.64 (0.98)**	5.02 (0.94)**	1.35 (5.23)	0.95 (5.39)
Interaction
Nc:HR-NoASD		− 0.80 (0.64)+		− 0.88 (0.66)+		0.13 (0.54)		− 0.17 (0.28)		0.28 (0.24)		− 0.77 (1.18)
Nc:HR-ASD		0.26 (0.81)		0.40 (0.82)		0.94 (0.67)+		0.48 (0.35)+		− 0.56 (0.29)+		0.18 (1.91)
N290
Adjusted R2	0.20	0.19	0.16	0.15	0.24	0.24	0.26	0.28	0.21	0.24	0.09	0.14
Variables [B coefficient (SE)]
Intercept	57.62 (3.12)	58.26 (3.36)	44.57 (2.78)	44.10 (3.003)	3.69 (3.20)	2.28 (3.38)	7.54 (1.75)	7.44 (1.83)	1.01 (1.33)	1.03 (1.40)	7.79 (6.8)	9.79 (1.16)
Mother-Stranger response	0.02 (0.34)	0.01 (0.54)	0.22 (0.30)	− 0.10 (0.49)	0.52 (0.30)	0.29 (0.49)	0.13 (0.17)	− 0.14 (0.26)	− 0.23 (0.15)	− 0.12 (0.22)	− 0.13 (0.76)	− 0.25 (0.18)
Maternal education	− 2.22 (1.59)	− 2.61 (1.72)	− 0.02 (1.42)	0.19 (1.54)	4.34 (1.58)**	5.14 (1.69)**	1.65 (0.86)	1.69 (0.91)	0.51 (0.68)	0.55 (0.72)	− 0.82 (3.5)	1.12 (0.60)
Group
HR-NoASD	− 7.86 (2.34)**	− 8.16 (2.41)**	0.83 (2.09)	1.03 (2.16)	0.43 (2.18)	1.34 (2.29)	− 0.35 (1.19)	− 0.29 (1.24)	0.90 (1.02)	0.89 (1.03)	4.08 (5.0)	− 0.60 (0.83)
HR-ASD	− 10.21 (2.89)**	− 9.29 (3.03)**	− 7.77 (2.57)**	− 6.86 (2.71)*	− 3.20 (2.43)	− 3.42 (2.49)	− 3.57 (1.33)*	− 3.08 (1.35)*	4.50 (1.30)**	3.15 (1.45)*	2.1 (6.8)	− 1.50 (1.18)
Interaction
N290:HR-NoASD		− 0.33 (0.80)		0.38 (0.71)		0.76 (0.72)		0.28 (0.39)		− 0.01 (0.33)		0.24 (0.27)
N290:HR-ASD		1.04 (1.04)		1.06 (0.93)		− 0.33 (0.82)		0.72 (0.44)+		− 0.91 (0.48)+		0.89 (0.41)*
P400
Adjusted R2	0.25	0.36	0.18	0.28	0.35	0.32	0.28	0.36	0.20	0.47	0.17	0.25
Variables [B coefficient (SE)]
Intercept	57.62 (3.01)	58.37 (2.93)	44.47 (2.74)	44.78 (2.71)	4.95 (2.97)	4.12 (3.33)	7.86 (1.73)	7.16 (1.79)	1.09 (1.33)	0.27 (1.18)	10.31 (1.068)	10.26 (1.08)
Mother-Stranger response	0.48 (0.25)	0.21 (0.34)	0.32 (0.23)	0.01 (0.31)	0.69 (0.23)**	0.39 (0.49)	0.17 (0.13)	− 3.15 (1.27)	− 0.16 (0.12)	− 0.01 (0.13)	0.19 (0.09)*	0.03 (0.12)
Maternal education	− 2.17 (1.53)	− 2.66 (1.52)	0.02 (1.39)	− 0.20 (1.40)	3.93 (1.46)*	4.26 (1.61)*	1.55 (0.85)	1.76 (0.87)	0.49 (0.69)	1.05 (0.61)	0.92 (0.55)	0.91 (0.56)
Group
HR-NoASD	− 8.00 (2.26)**	− 8.00 (2.09)**	0.67 (2.06)	0.71 (1.9)	− 1.06 (2.00)	− 0.80 (2.08)	− 0.72 (1.16)	− 0.35 (1.12)	0.98 (1.03)	1.00 (0.84)	− 0.85 (0.80)	− 0.80 (0.76)
HR-ASD	− 10.04 (2.78)**	− 9.31 (2.59)**	− 7.79 (2.53)**	− 7.10 (2.39)**	− 4.04 (2.23)	− 3.62 (2.36)	− 3.78 (1.30)**	− 3.15 (1.27)*	4.67 (1.29)**	3.79 (1.08)**	− 2.33 (1.08)*	− 1.95 (1.04)
Interaction
P400:HR-NoASD		− 0.18 (0.56)		0.05 (0.52)		0.39 (0.63)		0.34 (0.34)		0.14 (0.22)		− 0.15 (0.20)
P400:HR-ASD		1.88 (0.65)**		1.67 (0.60)**		0.40 (0.65)		0.82 (0.35)*		− 1.21 (0.27)**		0.63 (0.24)*

p < 0.05 *, p < 0.01 **, p < 0.25 for Interaction +