The participants were in two groups: one was all disabled children (n = 96) which received services from the family-service unit at the municipality of Akureyri, and another simple random sample group from among their peers in Akureyri (n = 210).
Þátttakendur voru annars vegar öll fötluð börn (n = 96) sem fengu þjónustu frá Fjölskyldusviði Akureyrarbæjar og hins vegar einfalt slembiúrtak úr hópi jafnaldra þeirra á Akureyri (n = 210).