From: Prevalence and risk factors of autism spectrum disorders in preschool children in Sharkia, Egypt: a community-based study
Variable
Cases
(n = 3722)
No.
%
Age group
 2-3 years
1973
53
 4-5 years
1749
47
Sex
 Male
1887
50.7
 Female
1835
49.3
Risk
 Low risk
2691
72.3
 Medium risk
927
24.9
 High risk
104
2.8