Growing up In Ireland Cohort ’98 (Child Cohort)


Study number (SN): 0020-01 (Wave 1)
Growing up In Ireland Child Cohort Wave 1

Study number (SN): 0020-02 (Wave 2)
Growing up In Ireland Child Cohort Wave 2

Study number (SN): 0020-03 (Wave 3)
Growing up in Ireland Child Cohort Wave 3

Study number (SN): 0020-04 (Wave 4)
Growing up In Ireland Child Cohort Wave 4


Growing Up in Ireland - the National Longitudinal Study of Children is a landmark study of children and youth which has been running since 2006. The objectives of the study are outlined in a separate publication (Greene et al. 2010). In summary, the project seeks to further our understanding of what it means to be a child or young person growing up in modern Ireland, with a view to informing policy on what both helps and hinders development. A two cohort, cross-sequential longitudinal design was adopted and began with one cohort (Cohort ‘08) of 11,134 infants (aged 9 months) and a second cohort (Cohort ‘98) of 8,568 9-year-olds. Being longitudinal in nature, the same participants are followed over time. The families of Cohort ‘08 have been interviewed when the children were 9 months, 3 years, 5 years and subsequently 9 years of age, while Cohort ’98 and their parents/guardians were interviewed at 9, 13 and 17/18 years of age.

This wave of data concerns the Wave 4 interviews of Cohort ‘98 at 20 years of age. As the 20-year-olds are now adults, they are regarded as the main respondents. One parent was also asked to complete questionnaires.




Emotional Development/ Child Behaviour

  • Family life
  • Life styles
  • Play/ Leisure time activities
  • Emotional development
  • Family environment
  • Parental role
  • Parental participation


  • Pregnancy/ Antenatal care
  • Childbirth
  • Medical care
  • Diet and nutrition/ Breast-feeding
  • Physical activities/ Exercise
  • Physiological development
  • Anthropometric data

Education/ Cognitive processes

  • Mental development
  • Child day care
  • Educational environment
  • Teacher-student relationship




Accessing the data

To access the data, please complete a ISSDA Data Request Form for Research Purposes, sign it, and send it to ISSDA by email.

For teaching purposes, please complete the ISSDA Data Request Form for Teaching Purposes and follow the procedures, as above. Teaching requests are approved on a once-off module/workshop basis. Subsequent occurrences of the module/workshop require a new teaching request form.

Data will be disseminated on receipt of a fully completed, signed form. Incomplete or unsigned forms will be returned to the data requester for completion.


Please note that ISSDA provides access to the anonymised microdata file (AMF) version of the dataset only. To gain access to the full researcher microdata file (RMF) applications should be directed to the Central Statistics Office (CSO). For further information and to download an application form please see the following page:


Any work based in whole or part on resources provided by the ISSDA, should  acknowledge: “Growing Up in Ireland Child Cohort" and also ISSDA, in the following way: “Accessed via the Irish Social Science Data Archive -”.

Citation requirement

The data and its creators shall be cited in all publications and presentations for which the data have been used. The bibliographic citation may be in the form suggested by the archive or in the form required by the publication.


The user shall notify the Irish Social Science Data Archive of all publications where she or he has used the data.

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Journal Articles

Crowe, M, A O’Sullivan, C McGrath, O Cassetti, L Swords, and M O’Sullivan. 2016. Early

Childhood Dental Problems Classification Tree Analyses of 2 Waves of an Infant
Cohort Study.0 JDR Clinical &Translational Research, 1: 275-84.

Crowe, M., O'Sullivan M, O. Cassetti, and O' Sullivan A. 2017. Weight Status and Dental
Problems in Early Childhood: Classification Tree Analysis of a National Cohort. Dent J
(Basel), 5. doi:10.3390/dj5030025

Crowe, M., M. O' Sullivan, O. Cassetti, C. McGrath, and A. O’ Sullivan. 2016. Data mapping to
augment dietary intake values from a nutritional database to a national cohort
survey: protocols to improve quality of reported food intake. Proceedings of the
Nutrition Society, 75.

Crowe, M., M. O'Sullivan, O. Cassetti, and A. O'Sullivan. 2019. Estimation and consumption
pattern of free sugar intake in 3-year-old Irish preschool children. Eur J Nutr.

Crowe, M., O'Sullivan, M., Cassetti, O., & O'Sullivan, A. (2020). Estimation and consumption pattern of free sugar intake in 3-year-old Irish preschool children. European journal of nutrition59(5), 2065–2074.

Crowe, Michael, Michael O'Sullivan, Breige Ann McNulty, Oscar Cassetti, and Aifric
O'Sullivan. 2018. Data mapping from food diaries to augment the amount and
frequency of foods measured using short food questionnaires. Front Nutr, 5: 82.

Denny K., (2012) Breastfeeding predicts handedness Laterality. Laterality: Asymmetries of Body, Brain and Cognition: 17(3) , 361-368

Madden, D. (2014). THE RELATIONSHIP BETWEEN LOW BIRTH WEIGHT AND SOCIOECONOMIC STATUS IN IRELAND. Journal of Biosocial Science, 46(2), 248-265. doi:10.1017/S0021932013000187

Masukume, G., O' Neill, S.M., Baker, P. N., Kenny, L.C., Morton, S.M.B. and Khashan, A.S. (2018). The Impact of Caesarean Section on the Risk of Childhood Overweight and Obesity: New Evidence from a Contemporary Cohort Study. Scientific Reports, 8, Article number: 15113.


Matvienko-Sikar, K., Murphy, G., & Murphy, G. (2017). 'The role of prenatal, obstetric, and post-partum factors in the parenting stress of mothers and fathers of 9-month old infants'.  Journal of Psychosomatic Obstetrics & Gynecology

Perry, Catherine P., Keane, Eimear, Layte, Richard, Fitzgerald, Anthony P., Perry, Ivan J.  and Harrington, Janas M. (2015). The use of a Dietary Quality Score as a predictor of childhood overweight and obesity. BMC Public Health 2015

Reinhard et al. 2018. The Great Recession and the Health of Young Children: A Fixed-Effects Analysis in Ireland.  American Journal of Epidemiology.

Sharma, V., Cassetti, O., Winning, L., O'Sullivan, M. and Crowe. M. (2023). Protocol for developing a dashboard for interactive cohort analysis of oral health-related data. BMC Oral Health , 238.


Additional bibliography: