Though the prevalence of<unk>  is not precisely known, there are some estimates. The best data available are from studies of school age children, ages 6–13 years, living in Sweden and from Denmark where the diagnosis of AS children in medical clinics was compared to an 8-year period of about 45,000 births. The Swedish study showed an AS prevalence of about 1/20,000 and the Danish study showed a minimum AS prevalence of about 1/10,000.
Angelman syndrome
Cerebral palsy
Gitelman syndrome
Prader–Willi syndrome
FG syndrome
Rett syndrome
Perlman syndrome
Autism spectrum