NCDS Age 46 Sweep

Sweep details

Dates June 2004 to November 2005
Age 45-46
Achieved sample 9534 (cohort members)
Respondents Cohort members
Fieldwork agency NatCen Social Research
Survey mode Telephone
Data access

Main dataset available via the UK Data Service [SN 5579]. Visit the UK Data Service website to access the data.


The age 46 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 composition, housing, relationships, births and other pregnancies, children and the wider family, employment, income, education and training, computer use, basic skills (numeracy and literacy), general health, smoking, drinking, exercise, experience of crime, social participation, identity and self-esteem.

Special features at age 46

Use of the telephone

The age 46 sweep was the first time that any of the UK birth cohort studies had conducted a survey via telephone. The survey achieved an 81% response rate, which was comparable with face-to-face response rates which had been achieved in previous sweeps.


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

NCDS Age 46 Guide to the Dataset

User guide for the age 46 sweep of NCDS

Date published: 01/02/2006
PDF: 143,83 KB


NCDS 2006 Re-deposit User Guide

User guide to accompany the redeposit of data up to age 46

Date published: 01/11/2006
PDF: 87,19 KB


NCDS Age 23-50 Partnership Histories

A guide to the partnership histories dataset collected from age 23 onwards

Date published: 01/11/2011
PDF: 245,98 KB


Partnership Histories Guide (1974-2013)

Date published: 01/11/2017
PDF: 374,82 KB


Activity Histories Guide (1974-2013)

Date published: 01/10/2016
PDF: 594,01 KB


NCDS revised region variables

Date published: 01/03/2012
PDF: 523,56 KB


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


NCDS Age 46 Questionnaire Documentation

Paper representation of the CATI quesionnaire for the 2004 sweep of NCDS

Date published: 01/05/2004
PDF: 527,92 KB

Technical reports

NCDS Age 46 – Technical Report Appendix B – CATI Documentation Introduction

Date published: 05/01/2004
PDF: 83,55 KB


NCDS Age 46 Technical Report Appendix B – CATI Interview Documentation

Date published: 05/01/2004
PDF: 849,08 KB


NCDS Age 46 Technical Report

Technical report for the 7th sweep of NCDS

Date published: 01/06/2007
PDF: 185,72 KB


NCDS Age 46 Technical Report Appendix A: Telephone Survey Instructions

Instructions for the telephone survey used for the age 46 survey of NCDS.

Date published: 01/05/2004
PDF: 332,57 KB


NCDS Age 46 Appendix A: Letters and Showcard

The letters and showcard used for the age 46 sweep of NCDS.

Date published: 01/05/2004
PDF: 96,49 KB


NCDS 2004 – Technical Report Appendix C – CodeBook and Edit Instructions

Date published: 01/06/2004
PDF: 240,26 KB

Data notes

No material of this type is available.


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


NCDS Birth-Age 50 Target and Achieved Samples

Table of target and actual sweep samples for NCDS up to age 50

Date published: 01/05/2008
PDF: 21,84 KB


NCDS Ethical Review and Consent

Review of the ethical practices throughout NCDS

Date published: 02/06/2014
PDF: 1,76 MB

Contact us

Centre for Longitudinal Studies
UCL Social Research Institute

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London WC1H 0AL


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