1Levels of education are based on ISCED (the International Standard Classification of Education): ISCED 57 = higher education; ISCED 3 = completed secondary education; ISCED 02 = primary education or first stage of secondary education.
(') Koulutustasojen ryhmittely perustuu Cl 1 h­nimikkeistöön (kansainvälinen koulutustasoluokitus): CITE 5—7 = korkea­asteen koulutus; Cli κ 3 = suoritetut toisen asteen tutkinnot; CITE 0—2 = : peruskoulun ala­ ja yläaste.