BCS70 Birth Sweep

Sweep details

Dates April 1970
Age Birth
Achieved sample 17,196 (cohort members including 628 born in Northern Ireland who were not followed up in later sweeps)
Respondents Mothers, midwives, medical examinations
Survey mode Face to face
Data access

Main dataset available via the UK Data Service [SN 2666]. Visit the UK Data Service website to access the data.


BCS70 began as the British Births Survey, when data were collected about the births and social circumstances of over 17, 000 babies born in England, Scotland, Wales, and Northern Ireland. Data were collected using a questionnaire about the mother’s health and the circumstances of the families into which the babies were born. Questionnaires were completed by the midwives who had been present at the birth and, in addition, information was extracted from clinical records. The study aimed to examine the social and biological characteristics of the mother in relation to neonatal morbidity, and to compare the results with those of the 1958 National Child Development Study.


  • User guides
  • Questionnaires
  • Technical reports
  • Data notes
  • Additional
User guides

BCS70 Birth Sweep Survey Report

Report for the initial sweep of BCS70

Date published: 01/05/1970
PDF: 5,71 MB


Handling missing data in the CLS cohort studies – User Guide

This user guide aims to describe and illustrate a straightforward approach to missing data handling, while detailing some more general considerations around missing data along the way.

Date published: 03/06/2024
PDF: 1000,62 KB


BCS70 Birth Sweep Questionnaire

Questionnaire for the Birth Sweep of BCS70

Date published: 01/05/1970
PDF: 607,58 KB

Technical reports

No material of this type is available.

Data notes

BCS70 Review of Research on Health Behaviours

Review of research using information from the childhood waves of BCS70 (birth to 16 years) as either health outcomes or as predictors of later health outcomes.

Date published: 01/10/2013
PDF: 1,07 MB


Deriving highest qualification in NCDS and BCS70

This Data Note explains the derivation of variables on Highest Educational Qualification obtained by cohort members in the National Child Development Study (NCDS) and the 1970 British Cohort Study (BCS70).

Date published: 01/01/2011
PDF: 514,11 KB


BCS70 Revised Region Variables (Third Edition)

This User Guide accompanies the deposits at the UK Data Archive of derived variables for each sweep of BCS70. These derived variable datasets are found under the study number for each of the sweeps and include variables for country of interview, region and government office regions.

Date published: 01/02/2014
PDF: 307,78 KB


BCS70 Birth Sweep Derived Variables

This User Guide describes the dataset of derived variables for the birth sweep of the 1970 British Cohort Study.

Date published: 01/02/2013
PDF: 191,26 KB


BCS70 Ethical Review and Consent

Review of Ethical procedures used for each Sweep of BCS70.

Date published: 01/01/2019
PDF: 4,18 MB

Contact us

Centre for Longitudinal Studies
UCL Social Research Institute

20 Bedford Way
London WC1H 0AL

Email: clsdata@ucl.ac.uk

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