Documentation

The purpose of the Partnership Histories dataset is to merge all data on live-in relationships in successive sweeps into one longitudinal dataset. For the fifth edition (January 2026), the data has been updated to include partner data collected at sweep 11 (2021, Age 51) and includes partner information up to the date of interview between 2021 and 2024.

The purpose of the BCS70 activity histories dataset is the merge of all data on work and non-work activities, in the successive sweeps, into one longitudinal dataset. For the fifth edition (January 2026), the data has been updated to include reported activities from sweep 11 (2021, Age 51) with employment histories up to sweep interview date between 2021 and 2024.

This user guide provides an introduction to the fully harmonised time use diary data collected during the Age 14 Sweep of the Millennium Cohort Study.

This user guide provides information about the data arising from the Next Steps 2019 Web Survey.

This questionnaire pertains to the Next Steps 2019 Web Survey.

The comprehensive guide to the data from the UK Early Life Cohort Feasibility Study: Age 9-10 months sweep.

This document describes the process by which polygenic indexes (PGIs) for 44 traits have been constructed in four UK longitudinal cohort studies: 1958 National Child Development Study (NCDS), 1970 British Cohort Study (BCS70), Millennium Cohort Study (MCS) and Next Steps.

This user guide describes the data linkage of education administrative records from the publicly available Ofsted reporting of school inspections in England to survey data for cohort members in the Millennium Cohort Study (MCS).

A user guide which provides guidance and recommendations for using geographical identifiers in 1958 National Child Development Study Age 62 Sweep (Sweep 10) data.

This user guide documents the harmonised indicators of all self-reported measures related to asthma in five British cohort studies: the MRC National Survey of Health and Development (NSHD), the 1958 National Child Development Study (NCDS), the 1970 British Cohort Study (BCS), Next Steps, and the Millennium Cohort Study.