Table 2 Linear regression models of ERP components vs social communication measures

 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

 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)

 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)

 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)

 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

 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)

 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)

 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)*

 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

 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)

 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)

 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)*