Coronadashboard data explained
- Coronadashboard data explained

Vaccinations - Delivery, stock and readiness

Where do the numbers come from?

Data on deliveries and doses in stock is provided by the National Institute for Public Health and the Environment (RIVM). This is not available as an open data file.

The figures on willingness to vaccinate came from the RIVM behavioral study. RIVM supplied these figures as open data.

Download the csv file with the open data from the RIVM on vaccination readiness

View the description of the dataset on the RIVM website about vaccination readiness

How are the numbers calculated?

The ‘Deliveries’ graph on the dashboard shows the number of doses that the Netherlands has received and expects to receive. RIVM assumes that each vaccine vial contains a specific number of doses – BioNTech/Pfizer: 6.9 doses per vial; Moderna: 10 doses per vial; AstraZeneca: 11 doses per vial; and Janssen: 5 doses per vial. This may differ from the manufacturer’s instructions for some vaccines.

These figures include the vaccine doses for the Dutch Caribbean and the vaccine doses that the Netherlands donates to other countries.

Doses in stock per type of vaccine
In the graph ‘Doses in stock per type of vaccine,’ the dashboard shows the total and available stock per type of vaccine at the central storage site. The total stock covers stock that is available and stock that is not yet available. The stock that is not yet available comprises vaccines that still have to be checked.

The size of the stock fluctuates: shortly after a new delivery, the total stock of a vaccine is relatively high; just before the next delivery is released from quality control, the available stock is low.

These figures include the vaccine doses for the Dutch Caribbean and the vaccine doses that the Netherlands donates to other countries.

Vaccination readiness
The figures are the sum of participants in the behavioral study who have already been vaccinated and participants who want to be vaccinated. In the behavioral study, people are asked whether they have received an invitation for vaccination. The percentage on the dashboard for 'vaccinated or already vaccinated' consists of the sum of four answer categories, namely: 1) invitation received and already vaccinated, 2) invitation received and appointment made, 3) invitation received and planning to make an appointment, and 4) haven't received an invitation yet but want to be vaccinated.

The participants in the study are as close as possible a reflection of the population. However, it is known that certain groups are not well represented in the survey, such as people with a migration background. Vaccination readiness is lower in these groups. If these groups were well represented in the study, the figures would probably be slightly lower, according to RIVM.

Adjustments and corrections

Changes in the numbers
Up to and including round 11 of the behavioral study (held from 20 to 26 April), research was carried out into the vaccination readiness of people who had not yet received an invitation for vaccination. Only people who had not yet received an invitation were asked if they would like to have a shot against COVID-19. Because more and more people have received an invitation, this question over time produces a distorted picture.

From round 12 (held from 11 to 17 May), the question has therefore been adjusted as described above under 'How are the figures determined?'.

Other data on vaccination readiness
There are also other recurring studies that measure vaccination readiness, for example the I&O research study and the Ipsos study. RIVM is also conducting another study (WP3) that measures vaccination readiness, but this study is conducted less often. Statistics Netherlands conducts research every quarter.

The results of the studies may differ. This is partly because in the behavioral study RIVM only counts people who clearly answer 'yes' to the question of whether they want to get an injection, while other studies also count all people who 'probably' want an injection. The date of the test can also influence the willingness to vaccinate, because the willingness to vaccinate changes over time.