Growing Up in Ireland (GUI) Cohort ’08 (Infant Cohort) Wave 3 - 5 years, 2013

A two age cohort longitudinal design was adopted with one cohort of 11,134 infants (aged nine months) and the other of 8,568 nine-year olds, with a view to improving and understanding of children’s development across a range of domains.

Since the survey is longitudinal in nature respondents in both cohorts are interviewed on a number of occasions over the folowing few years. The 11,134 children representing the infant cohort were born between 1st December 2007 and the 30th June 2008 and data collection for the first wave at age 9 months took place between September 2008 and April 2009. The third wave of data collection took place between March and September 2013, when the cohort were 5 years of age, resulting in a completed data file of 9,001 cases.