Table 1 Participant demographics and descriptives

T1 Age, months

47.16

40.39

12.51–144.50

62.40

50.69

12.39–164.13

59.35

48.87

12.39–164.13

T3 Age, months

81.64

40.76

42.74–181.42

94.90

47.38

49.72–199.44

92.25

46.12

42.74–199.44

Full Scale Cognitive Score, SS

70.75

10.14

50–92

52.43

7.69

40–91

56.15

11.03

40–92

# Full Scale Cognitive Score < 70

6

46

52

T1 CBCL Anxiety Mean Raw Score

0.36

0.39

.08–1.30

0.36

0.28

.08–1.30

0.36

0.30

.08–1.30

T1 CARS Total Score

21.41

6.36

15.5–36

28.58

5.65

21–47.5

27.15

6.43

15.5–47.5

T1 RBS-R Bishop Factors

 Sensory Motor

3.92

2.47

0–9

5.94

3.77

1–17

5.53

3.62

0–17

 Restricted Interests

0.33

0.65

0–2

1.67

1.64

0–6

1.40

1.59

0–6

 Self-Injury

1.67

3.08

0–8

2.67

3.28

0–13

2.47

3.24

0–13

 Compulsive

3.25

3.60

0–11

3.46

4.58

0–21

3.42

4.38

0–21

 Ritualistic Sameness

4.58

3.94

0–12

5.00

5.45

0–24

4.91

5.16

0–24

T3 RBS-R Bishop Factors

 Sensory Motor

3.08

3.12

0–9

6.35

3.86

0–15

5.70

3.93

0–15

 Restricted Interests

1.00

1.59

0–5

2.10

1.72

0–6

1.88

1.74

0–6

 Self-Injury

0.67

1.23

0–4

3.21

3.54

0–15

2.70

3.37

0–15

 Compulsive

3.58

3.20

0–11

4.17

5.05

0–26

4.05

4.72

0–26

 Ritualistic Sameness

4.92

5.01

0–15

5.96

5.51

0–23

5.75

5.39

0–23