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The Millennium Cohort (MCS)

About the cohort

Start date: 2000-02 (children)
                 2000-02 (families)

Age at recruitment: 0 (children)
                              All Ages (family)

Sample size at recruitment: 19,519 (children)
                                          19,244 (families)

Estimated current sample size: 13,469 (children)
                                              13,287 (families)

Sample size at recruitment: Children 19,519
                                          Families 19,244

The Millennium Cohort Study (MCS) is a multi-disciplinary research project following the lives of around 19,000 children born in the UK in 2000-01. It is the most recent of Britain’s world-renowned national longitudinal birth cohort studies. The study has been tracking the Millennium children through their early childhood years and plans to follow them into adulthood. It collects information on the children’s siblings and parents. MCS’s field of enquiry covers such diverse topics as parenting; childcare; school choice; child behaviour and cognitive development; child and parental health; parents’ employment and education; income and poverty; housing, neighbourhood and residential mobility; and social capital and ethnicity.

The children and families have been contacted 5 times since recruitment at ages nine months, 3, 5, 7 & 11 years.

MCS is part of CLOSER (Cohort & Longitudinal Studies Enhancement Resources) which aims to maximise the use, value and impact of the UK’s longitudinal studies.

Core funders

  • Economic and Social Research Council



Principal Investigator: Professor Emla Fitzsimons


Centre for Longitudinal Studies
Institute of Education
20 Bedford Way


Tel: +44 (0)20 7612 6875
Fax: +44 (0)20 7612 6880

Page last updated: 13 Mar 2015


  • Gender: Male, Female
  • Sample size: 10,000-19,999
  • Age: 60 to 100
  • Anthropometric: Height, Weight, Waist circumference
  • Physical: Cardiovascular, Respiratory, Musculoskeletal, Hearing and vision
  • Psychological: Mental health, Cognitive function
  • Lifestyle: Smoking, Physical activity, Dietary habits, Alcohol
  • Socio-economic: Occupation, Finances, Family circumstances, Housing, Education, Ethnic group, Marital status, Social support
  • Biological samples: Saliva, Other