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        <topcClas xml:lang="en">Child development and child rearing</topcClas><topcClas xml:lang="en">Family life and marriage</topcClas><topcClas xml:lang="en">Children</topcClas>
      </subject>
      <abstract xml:lang="en">&lt;P&gt;Abstract copyright UK Data Service and data collection copyright owner.&lt;/P&gt;&lt;p&gt;&lt;i&gt;Background&lt;/i&gt;:&lt;br&gt;The&amp;nbsp;Millennium Cohort Study (MCS) is a large-scale, multi-purpose longitudinal dataset providing information about babies born at the beginning of the 21st century, their progress through life, and the families who are bringing them up, for the four countries of the United Kingdom. The original objectives of the first MCS survey, as laid down in the proposal to the Economic and Social Research Council (ESRC) in March 2000, were:&lt;/p&gt;&lt;ul&gt;&lt;li&gt;to chart the initial conditions of social, economic and health advantages and disadvantages facing children born at the start of the 21st century, capturing information that the research community of the future will require&lt;/li&gt;&lt;li&gt;to provide a basis for comparing patterns of development with the preceding cohorts (the&amp;nbsp;&lt;i&gt;National Child Development Study&lt;/i&gt;, held at the UK Data Archive under GN 33004, and the&amp;nbsp;&lt;i&gt;1970 Birth Cohort Study&lt;/i&gt;, held under GN 33229)&lt;/li&gt;&lt;li&gt;to collect information on previously neglected topics, such as fathers' involvement in children's care and development&lt;/li&gt;&lt;li&gt;to focus on parents as the most immediate elements of the children's 'background', charting their experience as mothers and fathers of newborn babies in the year 2000, recording how they (and any other children in the family) adapted to the newcomer, and what their aspirations for her/his future may be&lt;/li&gt;&lt;li&gt;to emphasise intergenerational links including those back to the parents' own childhood&lt;/li&gt;&lt;li&gt;to investigate the wider social ecology of the family, including social networks, civic engagement and community facilities and services, splicing in geo-coded data when available&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;Additional objectives subsequently included for MCS were:&lt;/p&gt;&lt;ul&gt;&lt;li&gt;to provide control cases for the national evaluation of Sure Start (a government programme intended to alleviate child poverty and social exclusion)&lt;/li&gt;&lt;li&gt;to provide samples of adequate size to analyse and compare the smaller countries of the United Kingdom, and include disadvantaged areas of England&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;Further information about the MCS can be found on the&amp;nbsp;&lt;a href="https://cls.ucl.ac.uk/cls-studies/millennium-cohort-study/" target="_blank" style="background-color: rgb(255, 255, 255);"&gt;Centre for Longitudinal Studies&lt;/a&gt;&amp;nbsp;web pages.&lt;/p&gt;&lt;p&gt;The content of MCS studies, including questions, topics and variables can be explored via the&amp;nbsp;&lt;a href="https://discovery.closer.ac.uk/item/uk.cls.mcs/0d8a7220-c61b-4542-967d-a40cb5aca430"&gt;CLOSER Discovery&lt;/a&gt;&amp;nbsp;website.&amp;nbsp;&lt;br&gt;&lt;/p&gt;&lt;p&gt;The first sweep (MCS1) interviewed both mothers and (where resident) fathers (or father-figures) of infants included in the sample when the babies were nine months old, and the second sweep (MCS2) was carried out with the same respondents when the children were three years of age. The third sweep (MCS3) was conducted in 2006, when the children were aged five years old, the fourth sweep (MCS4) in 2008, when they were seven years old, the fifth sweep (MCS5) in 2012-2013, when they were eleven years old, the sixth sweep (MCS6) in 2015, when they were fourteen years old, and the seventh sweep (MCS7) in 2018, when they were seventeen years old.&lt;br&gt;&lt;br&gt;&lt;i&gt;Safeguarded versions of MCS studies&lt;/i&gt;:&lt;br&gt;The Safeguarded versions of MCS1, MCS2, MCS3, MCS4, MCS5, MCS6 and MCS7 are held under UK Data Archive SNs 4683, 5350, 5795, 6411, 7464, 8156 and 8682 respectively. The&amp;nbsp;longitudinal family file is held under SN 8172.&lt;br&gt;&lt;br&gt;&lt;span style="font-style: italic;"&gt;Polygenic Indices&lt;/span&gt;&lt;br&gt;Polygenic indices are available under Special Licence SN 9437. Derived summary scores have been created that combine the estimated effects of many different genes on a specific trait or characteristic, such as a person's risk of Alzheimer's disease, asthma, substance abuse, or mental health disorders, for example. These polygenic scores can be combined with existing survey data to offer a more nuanced understanding of how cohort members' outcomes may be shaped.&amp;nbsp;&lt;br&gt;&lt;br&gt;&lt;span style="font-style: italic;"&gt;Sub-sample studies&lt;/span&gt;:&lt;br&gt;Some studies based on sub-samples of MCS have also been conducted, including a study of MCS respondent mothers who had received assisted fertility treatment, conducted in 2003 (see EUL SN 5559). Also, birth registration and maternity hospital episodes for the MCS respondents are held as a separate dataset (see EUL SN 5614).&lt;br&gt;&lt;br&gt;&lt;span style="font-style: italic;"&gt;Release of Sweeps 1 to 4 to Long Format (Summer 2020)&lt;br&gt;&lt;/span&gt;To support longitudinal research and make it easier to compare data from different time points, all data from across all sweeps is now in a consistent format. The update affects the data from sweeps 1 to 4 (from 9 months to 7 years), which are updated from the old/wide to a new/long format to match the format of data of sweeps 5 and 6 (age 11 and 14 sweeps). The old/wide formatted datasets contained one row per family with multiple variables for different respondents. The new/long formatted datasets contain one row per respondent (per parent or per cohort member) for each MCS family. Additional updates have been made to all sweeps to harmonise variable labels and enhance anonymisation.&amp;nbsp;&lt;span style="font-style: italic;"&gt;&amp;nbsp;&lt;br&gt;&lt;/span&gt;&lt;i&gt;&lt;br&gt;How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:&lt;br&gt;&lt;/i&gt;For information on how to access biomedical data from MCS that are not held at the UKDS, see the&amp;nbsp;&lt;a href="https://cls.ucl.ac.uk/data-access-training/genetic-data-and-biological-samples/" target="_blank" style="background-color: rgb(255, 255, 255);"&gt;CLS Genetic data and biological samples&lt;/a&gt;&amp;nbsp;webpage.&lt;br&gt;&lt;br&gt;&lt;span style="font-weight: bold;"&gt;Secure Access datasets&lt;/span&gt;:&lt;br&gt;Secure Access versions of the MCS have more restrictive access conditions than versions available under the standard Safeguarded Licence or Special Licence (see 'Access data' tab above).&lt;br&gt;&lt;br&gt;Secure Access versions of the MCS include:&lt;/p&gt;&lt;p&gt;&lt;/p&gt;&lt;p&gt;&lt;/p&gt;&lt;ul&gt;&lt;li&gt;detailed sensitive variables not available under EUL. These have been grouped thematically and are held under SN 8753 (socio-economic, accommodation and occupational data), SN 8754 (self-reported health, behaviour and fertility), SN 8755 (demographics, language and religion) and SN 8756 (exact participation dates). These files replace previously available studies held under SNs 8456 and 8622-8627&lt;br&gt;&lt;/li&gt;&lt;li&gt;detailed geographical identifier files which are grouped by sweep held under SN 7758 (MCS1), SN 7759 (MCS2), SN 7760 (MCS3), SN 7761 (MCS4), SN 7762 (MCS5 2001 Census Boundaries), SN 7763 (MCS5 2011 Census Boundaries), SN 8231 (MCS6 2001 Census Boundaries), SN 8232 (MCS6 2011 Census Boundaries), SN 8757 (MCS7), SN 8758 (MCS7 2001 Census Boundaries) and SN 8759 (MCS7 2011 Census Boundaries). These files replace previously available files grouped by geography SN 7049 (Ward level), SN 7050 (Lower Super Output Area level), and SN 7051 (Output Area level)&lt;/li&gt;&lt;li&gt;linked education administrative datasets for Key Stages 1, 2, 4 and 5 held under SN 8481 (England).&amp;nbsp; This replaces previously available datasets for Key Stage 1 (SN 6862) and Key Stage 2 (SN 7712)&lt;br&gt;&lt;/li&gt;&lt;li&gt;linked education administrative datasets for Key Stage 1 held under SN 7414 (Scotland)&lt;/li&gt;&lt;li&gt;linked education administrative dataset for Key Stages 1, 2, 3 and 4 under SN 9085 (Wales)&lt;br&gt;&lt;/li&gt;&lt;li&gt;linked NHS Patient Episode Database for Wales (PEDW) for MCS1 – MCS5 held under SN 8302&lt;/li&gt;&lt;li&gt;linked Scottish Medical Records data held under SNs 8709, 8710, 8711, 8712, 8713 and 8714;&lt;/li&gt;&lt;li&gt;Banded Distances to English Grammar Schools for MCS5 held under SN 8394&lt;/li&gt;&lt;li&gt;linked Health Administrative Datasets (Hospital Episode Statistics) for England for years 2000-2019 held under SN 9030&lt;/li&gt;&lt;li&gt;linked Hospital of Birth data held under SN 5724.&lt;/li&gt;&lt;/ul&gt;&lt;p&gt;The linked education administrative datasets held under SNs 8481,7414 and 9085 may be ordered alongside the MCS detailed geographical identifier files only if sufficient justification is provided in the application.&amp;nbsp;&lt;br&gt;&lt;br&gt;Researchers applying for access to the Secure Access MCS datasets should indicate on their ESRC Accredited Researcher application form the EUL dataset(s) that they also wish to access (selected from the MCS Series&amp;nbsp;&lt;a href="https://beta.ukdataservice.ac.uk/datacatalogue/series/series?id=2000031#!/access-data" target="_blank" style="background-color: rgb(255, 255, 255);"&gt;Access&lt;/a&gt;&amp;nbsp;web page).&lt;/p&gt;&lt;p&gt;&lt;/p&gt;</abstract><abstract xml:lang="en">&lt;p&gt;&lt;i&gt;MCS5:&lt;/i&gt;&lt;br&gt; The fifth sweep took place when the children were aged around 11 and in their last year of primary school. Fieldwork started in January 2012 and finished in February 2013. Interviews were conducted with the main carer (typically the child’s parent) and their co-resident partner (typically the child’s other parent). The cohort children had measurements taken of their height, weight and body fat; participated in three cognitive assessments and completed a self-completion questionnaire. A survey of class teachers was also conducted but only in England and Wales, and consent was collected from the parent and children to contact the teacher.&lt;br&gt;&lt;br&gt;&lt;span style="font-style: italic;"&gt;Latest edition information&lt;/span&gt;&lt;br&gt;For the 6th edition (October 2022), a new date file mcs5_family_interview, has been added due to the family level data being split out from the parent-level data to make future merging with MCS8 onwards easier. Two data files (mcs5_parent_interview and mcs5_parent_cm_interview) have been updated to include variables that were missed from the previous edition due to a technical error (mainly from the income and employment module). There has been some further restructuring of datasets (parent responses moved out of mcs5_cm_interview and placed into mcs5_parent_cm_interview). Derived SDQ scores have been added to mcs5_cm_derived and a derived Kessler score has been added to mcs5_parent_derived. In addition, the number of cases in the mcs5_hhgrid data file have changed due to updates. Users are advised to check the Longitudinal Family File held under SN 8172 for the sample size.&lt;br&gt;&lt;br&gt;&lt;span style="font-style: italic;"&gt;December 2024:&lt;/span&gt;&lt;br&gt;The family_interview data file has been removed.&amp;nbsp;The family_interview datasets contained some variables that have been moved to Secure Access. The datasets will be replaced at a future redeposit.&lt;/p&gt;&lt;table border="0" cellpadding="0" cellspacing="0" width="606"&gt;&lt;tbody&gt; &lt;/tbody&gt; &lt;/table&gt; &lt;p&gt;&lt;/p&gt;</abstract><abstract xml:lang="en">&lt;B&gt;Main Topics&lt;/B&gt;:&lt;BR&gt;</abstract><abstract xml:lang="en">The files currently included in the MCS5 study comprise data from the main Parent Interview, the Household Grid, Child Measurement and Assessment and the Cohort Member self-completion questionnaire. The Parent Interview file comprises data from the Main Respondent, Partner Respondent and Proxy Respondent questionnaires, which covered household information; family context; education, schooling and childcare; child and family activities; parenting activities; child’s health; parent’s health; employment, income and education; housing and local area; and other matters. The Household Grid file comprises demographic data on households and additional derived variables. The Child Assessments and Measurement files include cognitive and physical measurements, including verbal similarities; a memory task (officially named the Spatial Working Memory task); a decision-making task (officially named the Cambridge Gambling task); height; weight; and waist circumference and body fat measurement. The Cohort Member paper self-completion was given to all participant children. The Teacher Survey data covered information about the child (ability, attitude, behaviour, Special Educational Needs, friends); the child’s parents; streaming and setting, the child’s class; and basic demographics about the teacher.&lt;br&gt;</abstract>
      <sumDscr>
        <collDate xml:lang="en" event="single">January 2012 - February 2013</collDate><collDate xml:lang="en" date="2012-01-01T00:00:00Z" event="start">01 January 2012</collDate><collDate xml:lang="en" date="2013-02-01T00:00:00Z" event="end">01 February 2013</collDate>
        <nation xml:lang="en">United Kingdom</nation>
        <anlyUnit xml:lang="en">Individuals<concept/></anlyUnit><anlyUnit xml:lang="en">Families/households<concept/></anlyUnit><anlyUnit xml:lang="en">National<concept/></anlyUnit>
        <universe xml:lang="en" clusion="I">The sample population for MCS was drawn from all live births in the United Kingdom over 12 months (from 1 September 2000 in England and Wales and for 59 weeks from 22 November 2000 in Scotland and Northern Ireland).</universe>
        <dataKind xml:lang="en">Numeric</dataKind>
      </sumDscr>
    </stdyInfo>
    <method>
      <dataColl>
        <timeMeth xml:lang="en">Longitudinal/panel/cohort<concept/></timeMeth>
        <sampProc xml:lang="en">Multi-stage stratified random sample<concept/></sampProc>
        <collMode xml:lang="en">Face-to-face interview<concept/></collMode><collMode xml:lang="en">Self-administered questionnaire<concept/></collMode><collMode xml:lang="en">Psychological measurements and tests<concept/></collMode><collMode xml:lang="en">Educational measurements and tests<concept/></collMode><collMode xml:lang="en">Observation<concept/></collMode><collMode xml:lang="en">Physical measurements and tests<concept/></collMode>
      </dataColl>
    </method>
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