From: Repetitive and restricted behaviors and interests in autism spectrum disorder: relation to individual characteristics and mental health problems
n
%
Age groups
Early childhood
639
23.2
Middle childhood
1361
49.3
Adolescence
758
27.5
Total
2758
100
Sex
Males
2383
86.4
Females
375
13.6
Cognitive Level groups
120+
615
22.3
84–119
612
22.2
49–83
921
33.5
<=48
604
22
2752