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FAQs

What is C-Score?

C-score tells you about your current and likely future health. C-score is a comprehensive (hence the "C") one number score that explains the likelihood that you may suffer life-threatening health events in the next 10 years and compares that to a database of 500,000 UK people from the UK Biobank.*

Your C-score results are broken down into seven lifestyle factors that we call “domains”. To complete your C-Score, you go through each of the seven domains; for example, drinking, smoking, and reaction time, to get your general health score. This takes approximately 10 minutes to complete. You can do it from home and you only need a smartphone.

C-Score is only a general measure of health and does not take into account any pre-existing conditions you may have. It’s not a medical assessment and should not replace a visit to your healthcare practitioner. You must be aged 18 or over to calculate your C-Score.

*The UK Biobank is a national health database made up of 500,000 people aged between 40-69 years whose health data was collected between 2006-2010 and who are still sharing their data so their health can be tracked. Find out more about the UK Biobank.

What are the elements of C-Score?

C-score consists of seven different health-related domains. Some we collect using your response to questions, and others are measured through your smartphone camera.

  1. Self rated health - the app asks you how you feel about your overall health, since you know your body best.
  2. Resting heart rate - the app measures your heart rate simply by placing your finger over the smartphone’s camera.
  3. Sleep - the app contains a questionnaire that captures how many hours you’ve slept on average over the last week and the quality of that sleep.
  4. Smoking - the amount of tobacco cigarettes you smoke during an average week.
  5. Alcohol - the type(s) and volume of alcohol you drink during an average week.
  6. Waist to height ratio - your smartphone’s camera is used to determine your waist circumference (you may need an extra pair of hands to help you).
  7. Reaction time - a simple test where you lift your finger once a shape changes colour.

Once you’ve completed each health domain, you can see how you compare to others across the UK Biobank participants. Each of your domain inputs are then used to calculate an overall number between 0 and 100; this is your C-Score.

How do you work out my C-Score?

Your C-Score is calculated using an evidence-based mathematical model that assigns points for each answer or data input to provide an overall score between 0 and 100. These health areas are called domains and include your resting heart rate as well as six other lifestyle factors; self-rated health, sleep, smoking, alcohol consumption, waist to height ratio and reaction time.

These aren’t all the factors that make you healthy or unhealthy, but they are modifiable indicators that our scientists and clinicians have taken from the medical literature as having the greatest impact on a person’s general health.

The health domains which contribute to the mathematical model have been carefully selected through scientific review and workshops with global experts in the fields of epidemiology, public health and neuroscience.

What does my C-Score mean?

Each of the seven health domains have different weightings. We enter your results into the C-Score model to give you a score out of 100 that represents the likelihood that you may suffer life-threatening health events in the next 10 years and compare that to a database of 500,000 UK people from the UK Biobank.

Generally speaking, the higher your C-Score score, the better your general health is. Your current health is a good predictor of your future health.

For the most accurate measure of your general health, it’s recommended to complete all seven health domains.

C-Score has been designed to be able to change as your health does, meaning you can make changes to improve it. We believe small changes taken every day can make a big difference to your general health in the long run.

How does C-score work out my domain scores?

Going through the C-Score journey, you’ll be asked to complete seven health domains. You will do this via a combination of lifestyle questionnaires and data capture using your smartphone’s camera. You will be shown your answer or data for each domain and it will be compared against the distribution from the 500,000 people in the UK Biobank.

Domains have been carefully considered by scientists in both the development and validation of C-Score.

How do I interpret my domain results?

Your domain results are unique to you and shows how you’re doing in a particular area of health. When looking at your C-score results, you’ll also be shown how well you’re doing in that particular area compared to the people in the UK Biobank. You’ll see what percentage of people in the UK Biobank gave a similar or different answer to yours or had data in the same or different range as you.

Where does the evidence for C-Score and selection of domains come from?

Scientists, clinicians and experts have analysed over 500 medical publications that cover indicators of health to develop C-Score. All of the factors or domains that make up your C-Score were selected for their modifiable nature, meaning that by making certain lifestyle changes, you can improve your score and as a result your general health. It’s a tool to help you understand the makeup of your health and wellbeing whilst empowering you to make changes that are right for you.

How can C-Score help me?

Your C-Score is a simple and accurate measure of your general health. By looking at all the different domains that make up your health, like smoking and sleep, you can look at your lifestyle in manageable chunks to make positive changes. What’s more, C-Score can help you to prioritise the areas of your health that are identified as needing the most attention. Measuring, monitoring and modifying your lifestyle within each of the health domains that make up your C-Score can make a difference to your health over time.

How can I improve my C-Score?

You can improve by acting on one or more domains of health that are included in C-Score. For example, if your alcohol consumption is high, you may want to try cutting out drinking during the week or drinking less on the weekends. By improving your domain scores, you can get a higher C-Score and, in doing so, are more likely to achieve better general health.

Who are you comparing my domain and
C-Scores against?

You are compared against half a million individuals in the UK Biobank*, who we have validated C-Score on. In time, as C-Score grows, we plan to compare you against people who are more like you (age, gender, etc.).

*The UK Biobank is a national health database made up of 500,000 people aged between 40-69 years whose health data was collected between 2006-2010 and who are still sharing their data so their health can be tracked. Find out more about the UK Biobank.

Is C-Score a medical device?

C-Score is not a medical device. C-Score is only a general measure of health and does not take into account any pre-existing conditions you may have. It’s not a medical assessment and should not replace a visit to your healthcare practitioner. You must be 18 and over to calculate your C-Score. If you have any health concerns please contact your healthcare provider or GP.

Is C-Score a valuable indicator to track over time?

By measuring your C-Score regularly, you can keep track of your general health. You can use C-score to set personal health goals, whether that’s getting extra sleep at night or trying to lose a little weight.

Will anyone else see my C-Score?

No one will see your C-Score unless you share it with them. When you complete your C-Score any information that could identify you, like your email address, are automatically removed.

Is C-Score something to do with COVID-19?

C-Score is a measure of your general health and has nothing to do with COVID-19.

What should I do if I’m worried about my health? 

If you are worried about your health at all, you should see a doctor. The C-Score app cannot diagnose or treat any health conditions and doesn’t provide you with any personalised treatment recommendations. The app is a way to measure your general health but should not take the place of medical advice. All features of the app are to be used as an indicator, not as a treatment alternative.

Can you give me advice around improving my health? 

With C-Score, you can get a simple, accessible and accurate measure of your general health. We start by giving you your domain results and overall C-Score, then it’s up to you to make the right choices.

If I improve my health, will my C-Score change?

Your C-Score is broken down into seven different health domains which have been carefully selected for their modifiable nature, meaning that by making certain lifestyle changes you can improve your score and, most likely, your general health. C-Score empowers you to understand the elements that contribute to your health and wellbeing so that you can make the right changes.

Can my GP use my C-Score to help understand any health issues?

Your C-Score is designed to help improve your engagement with your general health by tracking common lifestyle factors that contribute to it. C-Score should not replace any advice and treatment plans your healthcare team provides you.

How is my health information stored?

Any protected health information is always de-identified according to stringent data security guidelines. It is then stored in a cloud based encrypted database. It can not be reverse engineered from encryption.

Who is CDV?

Combining Chelsea FC expertise in health, fitness, sports science and nutrition with our own leading digital and consumer product talents. We design products that solve consumer problems, disrupt markets and appeal to consumers and partners way beyond football.

We create, develop and operate innovative technology-led product start-ups in fields associated with elite sports. Each of our products take an accelerated route from concept through build and production to launch and onto future growth.

Who is Huma?

Huma is a UK-based healthcare technology company that partners with scientists, technologists and healthcare professionals to understand, treat and ultimately prevent ill health.

How do I know my data is safe? 

In addition to de-identification, the remaining data is stored behind top level industry standard protection and is always encrypted. Any access to the data by APIs or third parties for processing is strictly on the “need to know” and temporary security key basis.

Can I delete my personal information from the C-Score health app?

We do our best to make sure you are able to have control over the use of your personal data where possible, and to make sure you can exercise your rights over your personal data. These rights include the right to request the deletion of your personal data.

We also aim to ensure that we keep the minimum amount of personal data necessary to provide you with the app. We keep your health data as de-identified as possible and many of our activities in providing the app to you do not require us to hold data which identifies you. This means that if you contact us to request the deletion of your data, we may not be in a position to identify you. If this is the case we’ll let you know in our response to your request.

You can email us at privacy@chelseadigitalventures.com if you have questions about deleting your personal data.

How can I report a problem with my C-Score health app?

If you find a problem with the C-Score app, please send an email to support@c-score.com