Related Experiment Video
Updated: Oct 5, 2026

Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers
Published on: March 14, 2018
Rett's syndrome: prevalence and impact on progressive severe mental retardation in girls
Abstract:
The prevalence of Rett's syndrome was studied in a part of southwestern Sweden comprising five counties and the city of Gothenburg. In a population of 315469 children and adolescents, 6-17 years of age, 10 cases were detected, all girls. The corresponding prevalence was 0.65/10 000 girls, i.e. about twice that of phenylketonuria (PKU) in the same area. As progressive brain disorders/metabolic diseases together constitute 5-6% (1.5-2.0/10 000 children) of the aetiologies among severely mentally retarded persons of this age group in central Sweden, it can be concluded that within this group Rett's syndrome should be considered as an aetiological factor to think of in females. This syndrome might well be responsible for one-fourth to one-third of such cases among girls.
Related Concept Videos
Probability Laws
REM Sleep Behavior Disorder
RBD is significantly associated with...
Anorexia Nervosa
Symptoms and Physical Effects
Individuals with anorexia nervosa commonly exhibit extreme...
Bulimia Nervosa
Rational Emotive Behavior Therapy
Autism Spectrum Disorder
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.

