Data and cohort

Our Future Health data files

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The Our Future Health cohort

The Our Future Health programme is open to all adults (18 years and older) living in the UK. The data that we’ve gathered so far includes:

• 1,900,557 participants who have consented to take part and completed our baseline health questionnaire
• a subset of 102,103 participants with geographical data
• a subset of 1,703,250 participants successfully linked to an NHS number (of which 1,648,662 participants have at least one secondary care or death record)
• a subset of 1,433,275 participants with clinic measurements data, which includes body size and circulatory function
• a subset of 650,870 participants who have been successfully genotyped

In July 2022, we started recruiting participants in England. Since then we have expanded to cover Scotland and Wales. We will begin active recruitment in Northern Ireland in November 2025.

Go to the programme design and recruitment documentationopens in new tab

Our aim is to build a data set that reflects the UK population. The following tables show the current composition of our cohort.

Cohort ages

Participant age	Cohort percentage
18 to 39	24.4%
40 to 59	37.2%
60 to 79	36.2%
80+	2.2%

Cohort self-reported sex

Participant sex registered at birth	Cohort percentage
Female	57.3%
Male	42.7%
Other	<0.1%

Cohort ethnicities

Participant ethnicity	Cohort percentage
Asian	5.4%
Black	1.5%
White	89.9%
Mixed	1.8%
Other	1.4%

View the Characteristics of Our Future Health participants (PDF)

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The available data

The current data available includes:

• participant data - which contains registration, consent and baseline demographic information collected across all consented participants
• participant geographies data - which contains geographic information derived from participants’ self-reported address at the time of registration to the Our Future Health programme
• questionnaire data - which contains self-reported health information, details about participants' household, socioeconomic status, work and education history and family history
• genotype array data – which contains single nucleotide polymorphism (SNP) data extracted from blood and made available in two different file formats
• linked health records data – which contains health records provided by the National Health Service (NHS) in England and registrations of death from the Office for National Statistics (ONS)
• clinic measurement data – which contains height, body weight, body mass index, waist circumference, blood pressure, heart rate and heart rhythm

Data sets are stored and accessed in the Our Future Health Trusted Research Environment (TRE).

Participant data

The participant data set includes self-reported demographic information about:

• ethnicity
• gender and sex
• month and year of birth

It also includes information relating to registration and consent:

• month and year of registration with Our Future Health
• month and year of consent to take part in the Our Future Health research programme

This data set is gathered at various times, such as during participant registration and as part of the baseline health questionnaire.

Go to the participant data documentationopens in new tab

Participant geographies data

The participant geographies data currently consists of a single dataset called the Country and Region table. This table includes the country and region linked to each participant’s self-reported address collected during their registration for the Our Future Health programme.

The United Kingdom (UK) is made up of four countries, called the devolved nations:

• England
• Scotland
• Wales
• Northern Ireland

England itself is divided in to nine official regions:

• North East
• North West
• Yorkshire and the Humber
• East Midlands, West Midland
• East of England
• London
• South East
• South West

These regions, together with the three other devolved nations, comprise the large-scale political and/or geographical divisions of the UK.

We are releasing the geographic data in stages. The initial releases include a subset of participants who joined the programme earliest, specifically those who registered between 2021 and 2022. Future releases will expand to include all participants who:

1. Registered before the cut-off date for that release, and
2. Have fully completed and submitted their questionnaire.

Data for participants who have fully withdrawn from Our Future Health is not included, as those data are deleted routinely after they request to withdraw. Participants who have fully withdrawn from the programme since the last data release will not be included in the current data release.

Only registration address is used. No subsequent address changes or participant relocations are reflected.

Go to the participant geographies documentation opens in new tab

Baseline health questionnaire data

There are 2 versions of the baseline health questionnaire. Version 1 of the questionnaire contains 202 questions, and the current version (version 2) contains 286 questions. Version 2 went live in November 2022. Not all participants see every question. Some questions are presented selectively, depending on participant responses.

The questions are grouped into five sections:  

• about you and your household – for example, age, sex, height, weight, ethnicity and living situation
• work and education – for example, income, employment history and highest educational attainment
• lifestyle – for example, socialising, screen use and alcohol intake
• family health history – for example, siblings' and parents' health
• personal health history – for example, health check-ups and screenings, diagnoses, medications and any current symptoms

Go to the baseline health questionnaire data documentationopens in new tab

Prevalence tables

Each quarter, we produce prevalence tables across a range of outcome variables using data from our latest release.

Below are the latest prevalence tables:

• Disease prevalence P11 (XLSX, 35KB)
• Medication prevalence P11 (XLSX, 37KB)

Genotype data

The first release of our genotype array data was made available in the Our Future Health TRE on 12 December 2023. The current release consists of 707,522 genetic variants across 650,870 participants who have also completed the baseline health questionnaire (290,667 male, 360,203 female).

Data sets are available in two common file formats, for 25 chromosomes, with each accompanied by sample level metadata to aid quality control (QC).

Genotype array data:

• Variant Call Format Files (VCF) and associated files
• Binary GEN file format (BGEN) and associated files

Metadata:

• Sample level QC file

Go to the genotype array data documentationopens in new tab

Linked health records data

The first release of our linked health records data was made available in the Our Future Health TRE on 26 June 2024 and included 4 data sets:

• Admitted Patient Care (HES APC) – episodes of care where a participant is admitted at NHS hospitals in England
• Accident and Emergency (HES A&E) – attendances recorded at major A&E departments, single specialty A&E departments, walk-in centres, and minor injury units at NHS hospitals in England
• Outpatient (HES OP) – outpatient appointments at NHS hospitals in England
• ONS Death Registration – death registration (date of death, registrar designation) and mortality data (cause of death, age at death) for England and Wales

In the September 2024 release, we added two additional data sets from the National Disease Registry Service (NDRS) in England:

• Cancer Registration, which comprises two tables:

  • Cancer Registry Treatment - event-level data with information on treatments received for a given tumour
  • Cancer Registry Patient Tumour - tumour-level data with information on each tumour, including site and diagnosis
• Cancer Pathway - information on the services a participant accessed in their journey from diagnosis to treatment

In the September 2025 release, we added an additional dataset, the Emergency Care Data Set (ECDS). This contains data about why people attend emergency departments and the treatment they receive at hospitals in England.

A Linked Participants table is also available alongside any approved linked health record data. This confirms all participants who have been successfully linked to an NHS number regardless of whether recorded data are present within a given release.

Linked health records data available

Data set	Number of participants
NHS Admitted Patient Care (HES APC)	1,373,800
NHS Accident and Emergency (HES A&E; up to April 2020)	1,184,225
Emergency Care Data Set (ECDS: April 2020 onwards)	951,149
NHS Outpatient (HES OP)	1,598,142
NHS Cancer Registry Treatment	121,613
NHS Cancer Registry Patient Tumour	144,966
NHS Cancer Pathway	89,397
ONS Death Registration	3,840

Go to the linked health records data documentationopens in new tab

Clinic measurements data

The first release of our clinic measurements data was made available in the Our Future Health TRE on 12 December 2024.

This data set consists of baseline physical health measurements for over 1 million participants, taken at their clinic appointment by trained staff. Measurements include:

• height
• weight
• body mass index
• waist circumference
• heart rate and rhythm
• blood pressure

Go to the clinic measurements data documentationopens in new tab

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Our data releases

We release new data into our TRE on a quarterly basis as our cohort grows.

For more information on our latest release and what has changed since previous releases, view our data release documentation for Release 12.opens in new tab

Stay up to date

Would you like to stay up to date with our work? Sign up for updates and tell us what you'd like to know.opens in new tab

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Protecting the data

We de-identify all participant data before it’s available for use. All researchers will need to become registered researchers at Our Future Health and have an approved research study before they're given access to the data for research purposes.

As a registered researcher at Our Future Health:

• you must access the data for your research study in accordance with an approved study application
• you must have completed information governance training that covers UK GDPR within the past 12 months
• your organisation must sign our resource terms and conditions

Find out how to apply to access the data.

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Updated: 08 October 2025