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 (LS) contains the census data and some life events data of approximately one million sample members, collected over 40 years. CeLSIUS is funded by the ESRC to provide free support to researchers wishing to use this data.

About the ONS Longitudinal Study

About the ONS LS

Find out more about the study

About the ONS Longitudinal Study

Using the ONS LS

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 ONS LS research projects and the resulting outputs

About Celsius


Meet the team

Wordpress dashboard

Linking our Lives Blog

Our blog showcases outstanding research using the ONS LS


Linking our Lives Podcast

In conversation with researchers and users of ONS LS research


Research and policy briefs

Policy and research briefing notes on research using the ONS LS

News and events


UK Census Longitudinal Studies conference, Cardiff Castle, 20th Sept 2022

This event brings together the England and Wales, Scottish and Northern Ireland census Longitudinal Studies, to explore their research power. The programme will focus on the studies' unique contribution to the UK’s population data landscape and how they may be used. There is no registration fee and lunch will be provided. 

You can book your place using password Cardiff2022 – spaces are limited, but presentations will be recorded and there will be a virtual roundtable after the event for people who are unable to attend in person.


Language in Northern Ireland: Who has lost, gained or retained knowledge of Irish?

In 2020, the New Decade New Approach (NDNA) deal for Northern Ireland outlined a strategy for the Irish language. Then in May 2022 the Identity and Language Bill was introduced in Westminster, providing for the strategy to be granted official status. But who knows Irish, and what changes have occurred? In this blog, Dr Ian Shuttleworth discusses findings from a research project using census data to look at changes between 2001 and 2011. 


Measuring health: does it matter how we do it?

In Episode 8 of Linking Our Lives we're joined by Drs Emily Murray and Brian Beach from University College London to discuss recently submitted evidence to the UK's 2nd State Pension Age Review using findings from Emily's Health Foundation funded research project on the Health of Older People in Places. Here they talk about the research, explain why the way we measure health matters and discuss the implications for policy makers and pensioners. 


Person or place? Finding out more about what drives health inequalities

It is known that life expectancy is higher in some areas of the UK than in others. These inequalities in health are linked to the socio-demographics of the area: poorer health and shorter life expectancy tends to be a feature of less affluent areas of the country. The latest Linking Our Lives blog, the third in a series on cancer and social inequality, Fiona Ingleby discusses research which uses data from cancer patients included in the ONS Longitudinal Study to assess the evidence on health inequalities and cancer outcomes.


Does social position affect our chances of contracting bowel cancer?

We know cancer incidence is linked to socio-economic status, and this differs according to types of cancer. In the second of three blogs on research using the ONS-LS to explore cancer and social status, Charlotte Sturley has examined diagnoses of bowel cancer, and found some clear evidence of a social effect.


Cancer risk and social status: what are the links?

How does our social environment influence our chances of getting cancer? The latest Linking Our Lives blog highlights new research using ONS LS data by Professor Robert Hiatt and colleagues, which shows there is a link between socio-economic status and cancer incidence, but also throws up some unexpected findings. In the first of a series of three blogs on socio-economic links to cancer, he discusses his work.


More news and events



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