The Millennium Cohort Study (MCS), which began in 2000, is conducted by the Centre for Longitudinal Studies (CLS). It aims to chart the conditions of social, economic and health advantages and disadvantages facing children born at the start of the 21st century. The study has been tracking the Millennium children through their early childhood years and into adulthood. Consents and linkage restrictions The consents to link the data are currently based on parental consents obtained when cohort members were aged 7. Parents/guardians were asked for consent to link their child’s survey data to health records (from birth up to age 14) and education records up to age 16. Parents/guardians were also asked for consent to link their survey data to their own health records. For MCS respondents in Wales the consent rate for linkage to health or education records was around 95% for cohort members and 87% for parents/guardians. For Wales in 2008, the overall matching rate for consented respondents was 99.62% At age 17 cohort members were asked to consent in their own right for health and education records (with no limitations) and the age 17 consents will be supplied to SAIL. Please note - When applying for Millennium Cohort Study (MCS) data, MCS cannot accept applications where PhD Students are the project lead. Project lead would need to be the PI or PhD supervisor. CLS requires a plain-language abstract summarising the research project which is a maximum of 150 words. This is a short description of the proposed research the applicant plans to do with the data, including the main research question(s). The plain-language abstract will be published online and should be written in accessible language that cohort members would readily understand.

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