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Table 2 Cognitive development least square means group comparisons at 6, 12, and 24 months

From: Behavioral, cognitive, and adaptive development in infants with autism spectrum disorder in the first 2 years of life

Cognitive development

HR-ASD-High (a)

HR-ASD-Mod (b)

HR-Neg (c)

LR-Neg (d)

Overall Group Comparisona

Post hoc comparisonsb

(n = 31)

(n = 18)

(n = 161)

(n = 98)

LSM

SE

LSM

SE

LSM

SE

LSM

SE

df1

df2

F

p

6 Month visit

 MSEL ELC

93.9

1.9

98.3

2.4

98.4

0.8

100.5

1.1

3

299

3.2

0.02

 

  Expressive Language

42.9

1.3

46.6

1.6

44.5

0.5

46.5

0.7

3

299

3.0

0.03

 

  Receptive Language

49.6

1.6

47.9

2.1

49.9

0.7

50.0

0.9

3

299

0.3

0.83

 

  Fine Motor

47.8

1.7

51.2

2.1

50.4

0.7

50.2

1.0

3

299

0.7

0.54

 

  Gross Motor

43.7

1.5

46.3

2.0

49.0

0.7

50.8

0.9

3

299

5.8

0.0007

a < d

  Visual Reception

47.3

1.6

50.5

2.0

51.4

2.0

53.9

0.9

3

299

4.8

0.0028

a < d

12 Month visit

 MSEL ELC

89.2

2.3

93.8

3.1

101.2

1.0

105.5

1.3

3

299

14.5

<0.0001

a < (c, d)

  Expressive Language

39.5

2.0

37.7

2.8

47.2

0.9

49.6

1.1

3

299

10.0

<0.0001

(a, b) < d

  Receptive Language

36.1

1.5

39.4

2.0

43.5

0.6

45.6

0.8

3

299

11.2

<0.0001

a < (c, d)

  Fine Motor

53.9

1.7

57.9

2.3

57.0

0.7

59.6

0.7

3

299

3.4

0.02

 

  Gross Motor

42.7

2.2

45.6

3.0

49.7

1.0

50.4

1.2

3

299

3.7

0.01

 

  Visual Reception

47.6

1.7

51.4

2.3

54.3

0.7

55.6

0.9

3

299

6.2

0.0004

a < d

24 Month visit

 MSEL ELC

75.8

3.0

84.1

3.9

103.1

1.3

109.4

1.7

3

299

38.0

<0.0001

(a, b) < (c, d)

  Expressive Language

36.1

2.1

39.1

2.7

49.0

0.9

51.7

1.2

3

299

18.3

<0.0001

a < (c, d), b < d

  Receptive Language

31.1

2.0

38.8

2.6

51.9

0.9

56.0

1.1

3

299

44.9

<0.0001

(a, b) < (c, d)

  Fine Motor

39.9

1.7

42.9

2.3

49.9

0.8

54.6

1.0

3

299

21.6

<0.0001

a < (c, d), (b, c) < d

  Gross Motor

38.4

1.6

43.9

2.1

50.2

0.7

52.0

0.9

3

299

19.8

<0.0001

a < (c, d)

  Visual Reception

39.9

2.0

45.0

2.6

54.9

0.9

55.9

1.1

3

299

20.4

<0.0001

a < (c, d), b < d

  1. MSEL Mullen Scales of Early Learning, ELC Early Learning Composite
  2. aThe Overall Group Comparison serves as an omnibus test comparing the means between the 4 groups to determine whether group means differ based on a mixed model with repeated measures. Model covariates included the difference between the child’s actual age at the visit from the scheduled visit age (6, 12, or 24 months). Other covariates included site and mother’s education. Two-sided at significance level of .05
  3. bPost hoc comparisons with step-up Bonferroni correction. Two-sided at significance level of .05