COVID Vaccination

What can we learn from our community about the UK’s COVID vaccination rollout?

What we've found

  • The majority of Evergreen Life users who’ve had the COVID vaccination and haven’t ever recorded a positive COVID-19 test have reported no side effects or just a sore arm at the point of injection.
  • However, users who’ve previously tested positive for COVID-19 most commonly report a sore arm or mild flu symptoms, rather than no side effects.
  • The vaccine rollout coincides with a drop in average anxiety levels for all age groups in our community.
  • The under 30s remain the most anxious age group among our community.
  • The AstraZeneca vaccine has been administered to more Evergreen Life users than the Pfizer vaccine.

The UK’s COVID-19 vaccine rollout began on 8th December 2020. We’ve been asking people in our Evergreen Life community to record their jab in the app, to encourage everyone to keep an accurate health record and so we can all understand more about the impact of the vaccines. Here’s what we’ve found out.

Side effects

We looked at what side effects people who’ve had the COVID-19 vaccines have reported.

The chart above shows that the majority of people who’ve had a COVID vaccine and have never recorded a positive COVID-19 test in the Evergreen Life community are reporting either no side effects or just arm pain at the site of injection. The next most common is mild flu-like symptoms. However for users who have previously reported testing positive for COVID-19, they tend to most commonly report having a sore arm or mild flu, rather than no side effects at all.

Vaccination rollout and anxiety levels

Statistics show that in 2020, perhaps understandably, average anxiety in the UK jumped to its highest level since records began. We’ve explored how people in the Evergreen Life community have been reporting anxiety levels over the last 12 months.

The line graph above shows that average anxiety levels in our community were highest just before April 2020. There’s been a significant drop in anxiety as the vaccine has been rolled out. However, those under 30 remain more anxious than the other age groups. Interestingly, anxiety in 30-55 year olds does seem to increasing at the moment, while it’s falling in other age groups.

Vaccine distribution

Which of the available vaccines have been administered more frequently? From the chart below, we can see that despite being later to the party, AstraZeneca has been administered to more Evergreen Life users.

Stay safe and please record in the Evergreen Life app when you have your vaccine, if you haven’t already. Download the app here.

For further information about the COVID vaccine, please read the NHS guidance here.

Statistical disclaimers:

Side Effects graph: This graph uses information provided by over 8,000 Evergreen Life users with a confirmed COVID-19 vaccination, and who answered a question about side-effects experienced. Users were asked “If you had side effects, which of the following was the most severe?“, and the percentage of users responding with each answer is plotted on the graph.

Anxiety graph: This graph uses over 170,000 responses to an anxiety question by over 50,000 Evergreen Life users since March 2020. Users are asked “Overall, how anxious did you feel yesterday?“, responding on a 10-point scale, with 10 being most anxious, and 0 being not at all anxious. A locally weighted scatterplot smoothing method is used (see to generate the curve and its confidence intervals (95% Confidence level). These curves are estimated separately for each age group and thus represent the average level of anxiety, for these groups, over time.

Vaccine distribution graph: This graph uses information provided by over 8,000 Evergreen Life users with a confirmed COVID-19 vaccination, and who answered a question about which vaccine they received. Omitted categories: “Don’t know”; “Moderna”; “Another vaccine” – these groups were too small (an average of 20 responses) to contribute any meaningful information to the graph.

Thanks for the feedback! Keep checking back for more.
We're sorry this wasn't for you. Why not let us know what you would like to see?