Majority of the children (77.3%) got their first diagnosis in the preschool years but still there were many children diagnosed late (after 6 years of age) despite significantly impaired cognitive development.
Meirihluti barnanna (77,3%) fékk sína fyrstu greiningu á leikskólaaldri en samt voru mörg börn að greinast seint (eftir 6 ára) þrátt fyrir verulega skertan þroska.