Autism spectrum disorder (ASD) comprises a set of chronic neurodevelopmental disorders with a wide range of symptoms and levels of severity.
1,2 Globally, the prevalence of ASD has been estimated to be 1% to 1.5%,
3 with a cumulative incidence up to 2.8% in recent birth cohorts in Denmark.
4 Although the onset of ASD is generally in childhood, it may be recognized and diagnosed later in life.
2 The number of children with a diagnosis of ASD has increased during recent decades,
1,2,5,6 and professionals have debated whether this increase is due to changes in diagnostic criteria, increased clinical or parental awareness, or increased prevalence of etiologic factors.
2,4-7