Participation in early childhood education for the EU is defined as the share of the population aged between four years and the age when compulsory education starts which participates in early education.
For other countries the indicator shown is the gross enrolment ratio for pre-primary education, which is the number of children in pre-primary education as a percentage of the eligible official school-age population corresponding to the same level of education in a given school year – it may include under and over-age enrolment.