CClinicalTrials.gg
CompletedNCT04928911Updated Jan 18, 2024

Expectations About the COVID-19 Vaccines

An observational study in Vaccine Adverse Reaction, sponsored by University of Aarhus. Completed at 1 site in Denmark. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-01-18.

Sponsored by University of Aarhus · Observational

Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
1,176
Ages
18 Years and older
Sex
All
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Study summary

This study collects information on expectations and attitudes towards the COVID-19 vaccines in participants about to receive a COVID-19 vaccine. This information will be linked to data on side effect occurrence collected in an independent study.

Read the detailed description

General hypothesis: Negative expectations and attitudes towards the vaccine are associated with a higher risk of side effects

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Conditions studied

  • Vaccine Adverse Reaction
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In context

Lead sponsor

University of Aarhus is the lead sponsor of 1,274 studies on the registry; 183 are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

Adults signed up to receive a COVID-19 vaccine in Denmark, who are also participating in the ENFORCE study

Eligibility criteria

Inclusion Criteria:

  • Must have signed up to receive a COVID-19 vaccine in Denmark
  • Participants are also a part of the ENFORCE study from which outcome data is obtained
  • Must be able to read and understand Danish
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Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
1,176 participants (actual)
Patient registry
No

Groups and cohorts

  • Adults receiving COVID-19 vaccine

    Adults about to receive a COVID-19 vaccine fill out a questionnaire of potential predictors of side effect occurrence

    Biological: COVID-19 vaccine

Interventions

  • BiologicalCOVID-19 vaccine

    Adults about to receive a COVID-19 vaccine fill out a questionnaire of potential predictors of side effect occurrence

06

What researchers measure

Primary outcomes

  1. Rate of local and systemic reactions (self-report)

    Data obtained from independent study

    Time frame: 7 days after vaccination

  2. Rate of local and systemic reactions (self-report)

    Data obtained from independent study

    Time frame: 14 days after vaccination

Secondary outcomes

  1. Grade 1-4 and serious adverse events

    Data obtained from independent study

    Time frame: 3-6 months after vaccination

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Study locations

1 site
  • Aarhus University
    Aarhus, Denmark
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References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jan 18, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT04928911
Lead sponsor
University of Aarhus
Responsible party
Sponsor
First posted
Jun 16, 2021
Start date
Jun 11, 2021
Primary completion
Mar 31, 2023
Completion
Mar 31, 2023
Last update
Jan 18, 2024

Study contacts

Lene Vase
study chair · University of Aarhus

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Dec 2023. You cannot join it, but the record below documents what was studied.

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Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

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