Table 2 Moderated regression models

Sensory Motor Behaviors

b

SE

p

 Intercept

5.89

0.42

 < .001

 Anxiety

-0.41

1.45

0.78

 Autism Severity

0.25

0.08

0.002

 T1 Sensory-Motor RRBs

0.39

0.13

.004

 T1 Age

-0.01

0.01

0.118

 Anxiety*Autism

-0.40

0.17

0.024

Restricted Interests

b

SE

p

 Intercept

1.95

0.21

 < .001

 Anxiety

0.33

0.72

0.648

 Autism Severity

0.06

0.04

0.117

 T1 Restricted Interest Score

0.38

0.14

0.010

 T1 Age

0.00

0.00

0.568

 Anxiety*Autism

-0.13

0.08

0.117

Self-Injurious Behavior

b

SE

p

 Intercept

2.77

0.39

 < 0.001

 Anxiety

0.02

1.35

0.986

 Autism Severity

0.12

0.06

0.069

 T1 Self-Injurious Behavior Score

0.49

0.13

 < .001

 T1 Age

0.01

0.01

0.587

 Anxiety*Autism

-0.14

0.16

0.402

Compulsive Behavior

b

SE

p

 Intercept

4.16

0.52

 < .001

 Anxiety

-0.92

1.95

0.639

 Autism Severity

-0.01

0.09

0.954

 T1 Compulsive Score

0.70

0.15

 < .001

 T1 Age

-0.00

0.01

0.786

 Anxiety*Autism

-0.22

0.22

0.319

Ritualistic Sameness

b

SE

p

 Intercept

5.91

0.63

 < .001

 Anxiety

-0.38

2.27

0.868

 Autism Severity

0.03

0.11

0.774

 T1 Ritualistic Sameness

0.53

0.16

0.001

 T1 Age

0.01

0.02

0.419

 Anxiety*Autism

-0.33

0.27

0.239

Total RRBs

b

SE

p

 Intercept

20.65

1.56

 < 0.001

 Anxiety

-0.67

5.63

0.906

 Autism

0.42

0.27

0.123

 T1 Total RRBs Score

0.52

0.14

 < 0.001

 T1 Age

0.01

0.04

0.844

 Anxiety*Autism

-1.19

0.67

0.081