BCS70 Age 38 Sweep

Sweep details

Dates October 2008 – May 2009
Age 38-39
Achieved sample 8,874 (cohort members)
Respondents Cohort members
Fieldwork agency NatCen Social Research
Survey mode Telephone
Data access

Main dataset available via the UK Data Service [SN 6557]. Visit the UK Data Service website to access the data.


The Age 38 Sweep involved a 25-minute telephone interview. The survey sought to establish the key events and circumstance changes that had happened to cohort members in the time that had elapsed since they were last interviewed. The main topics covered were: household situation, housing, relationships, children and wider family, family income and wealth, employment, lifelong learning, health and health behaviour.


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

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 Age 38 User Guide

Guide to the dataset for the BCS70 age 38 survey

Date published: 01/08/2010
PDF: 468,24 KB


BCS70 Partnership Histories (1986-2013) Guide

Date published: 01/10/2016
PDF: 370,43 KB


BCS70 Activity Histories (1986-2013) Guide

Date published: 01/07/2017
PDF: 660,51 KB


BCS70 Age 38 CATI Questionnaire Content

Summary of Content for the CATI questionnaire

Date published: 01/09/2008
PDF: 22,18 KB


BCS70 Age 38 Questionnaire Documentation

Introduction to and paper representation of the CAPI questionnaire for BCS70 age 38 Sweep

Date published: 01/10/2009
PDF: 1,02 MB

Technical reports

BCS70 Age 38 Technical Report

Technical Report for BCS70 age 38 Sweep

Date published: 01/03/2010
PDF: 497,75 KB


BCS70 Age 38 Technical Report Appendices

Appendices to accompany technical report for BCS70 age 38 Sweep

Date published: 01/05/2008
PDF: 11,48 MB

Data notes

Highest Qualification Derivation 2008

Date published: 07/07/2008
PDF: Unknown size


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 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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