Institute of Epidemiology & Health Care



We enable research using the Office for National Statistics (ONS) Longitudinal Study - the largest nationally representative longitudinal dataset in the UK

Longitudinal studies follow the lives of individuals over a long period of time, showing us how people are affected by changes in society. The ONS Longitudinal Study contains the census data and some life events data of approximately one million sample members, collected over 40 years. This service is free to the user.

About the ONS Longitudinal Study

About the ONS Longitudinal Study

Find out more about the study

About the ONS Longitudinal Study

Using the ONS Longitudinal Study

Find out how to access and use the data

Data dictionary

Data dictionary

Look up the variables in the study

Celsius Resources


Information and guidance to help you use the data

Research at Celsius


Current and past LS projects and the outputs resulting from this research

About Celsius


Meet the team

Wordpress dashboard

Linking our Lives Blog

Our blog showcases outstanding research using the LS 


Linking our Lives Podcast

In conversation with researchers and users of LS research


Research and policy briefs

Policy and research briefing notes on research using the LS



UKcenLS webinar

The UKcenLS is the collective name for the 3 UK Census Longitudinal Studies: the ONS Longitudinal Study (LS), the Northern Ireland LS (NILS) and the Scottish Longitudinal Study (SLS). On 10th December 2021 each research unit presented an overview of their LS, with sample sizes, data included, access procedures, etc - these are now available as YouTube videos:

  • CeLSIUS - Aly Sizer
  • NILS-RSU (this link will take you to a video file in your web browser, not youtube)
  • SLS-DSU - Lee Williamson

Also, exciting recent findings from researchers using the studies were showcased:


Do well-educated children make their parents healthier?

New blog which discusses the findings of a paper which uses ONS LS data, on the causal effect of children’s education on their parents’ health and longevity, by Cecilia Potente (Zurich University), Patrick Präg (Oxford University) and Christiaan Monden (Oxford University)


Addressing health: lessons from the past about ill health in the workplace

In Episode 5 of Linking our Lives, David Green, Professor of Historical Geography at Kings College London, Nicola Shelton, Professor of Population Health at University College London and social history enthusiast and volunteer Becky Darnill discuss the research project Addressing Health: Morbidity, Mortality and Occupational Health in the Victorian and Edwardian Post Office - a fantastic collaboration exploring the timing and geography of ill health, and the responses of the Post Office and the workforce!


New information for LS researchers: derived variables list (PDF)

Information on the syntax files that are available for LS researchers to use.


More news and events