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Completed

NCT Number: NCT05642754

Glassy Trial for Effects of Wearing Glasses

Randomized trial testing 6 forms of a communication summarizing the results of a recent study (about the effects of wearing glasses on reducing covid infection risk).

The goal of the trial is to test the effect of different language options to describe uncertainty, and of including the margin of error around the main result.

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Key information

Conditions

COVID-19 Coronaviridae Infections Coronavirus Infections Infections Lung Diseases Nidovirales Infections Pneumonia Pneumonia, Viral RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Virus Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Norwegian Institute of Public Health

Oslo, Norway

About this study

The study is designed as a proof-of-concept exercise to develop and test a communication meant to summarize the results of a recent randomized trial examining the effects of wearing glasses on the chance of developing COVID-19.

The objectives of the randomized trial are:

  • To compare the effects of three ways of communicating the overall uncertainty of the effects of wearing glasses to reduce the chance of getting COVID and
  • To compare the effects of including the margin of error (confidence interval) compared to not including it.

Researchers will conduct an online, parallel group, individually randomized, pragmatic trial using a 3x2 factorial design, ie, 3 uncertainly language options (GRADE language, colloquial language or none 2 options for the statistical margin of error for the main results (margin of error language or none).

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • >= 18 years old
  • literate in English or Norwegian
  • currently residing in Norway or the United States

Exclusion criteria

  • individuals who regularly wear any kind of glasses (i.e., prescription or sunglasses) all or most of the time

Treatment and study plan

Overall uncertainty language

Other

Researchers are testing different forms of information about overall study uncertainty and margin of error around main result

Other names: Margin of error around main result

Primary outcomes

  1. understanding of overall uncertainty of benefit (of wearing glasses to reduce the chance of covid infection)

    Time frame: within 1 day

    How sure about the effect (4 point scale from very unsure to very sure)

  2. understanding of overall uncertainty of harm (of wearing glasses to reduce the chance of covid infection)

    Time frame: within 1 day

    How sure about the effect (4 point scale from very unsure to very sure)

  3. sufficiency of what is known about the effects of wearing glasses to reduce the chance of covid infection

    Time frame: within 1 day

    How sure about the effect (4 point Likert scale)

  4. Understanding the margin of error around the benefit of wearing glasses to reduce covid

    Time frame: within 1 day

    this is a co-primary outcome which will be used only to compare the 3 versions that include the margin of error to the 3 versions that do not

Secondary outcomes

  1. perceived effect of wearing glasses to reduce chance of covid infection

    Time frame: within 1 day

    What is the effect on a 5 point scale (lowers a lot, lowers a little, no effect, increase a little, increases a lot

  2. how likely is it that wearing glasses reduces the chance of covid infection

    Time frame: within 1 day

    4 point scale (very likely, likely, unlikely, very unlikely)

  3. intended behavior (if there were a surge in covid in your area, how likely would you be to wear glasses to reduce the chance of covid infection

    Time frame: within 1 day

    4 point scale (very likely, likely, unlikely, very unlikely

  4. intended behavior (if there were very few cases of covid in your area, how likely would you be to wear glasses to reduce the chance of covid infection

    Time frame: within 1 day

    4 point scale (very likely, likely, unlikely, very unlikely

  5. perceptions fo information provided (trustworthy summary?)

    Time frame: within 1 day

    4 point Likert scale (strongly agree, agree, disagree, strongly disagree)

  6. perceptions fo information provided (sufficient summary?)

    Time frame: within 1 day

    4 point Likert scale (strongly agree, agree, disagree, strongly disagree)

  7. perceptions fo information provided (clarity of info about benefit)

    Time frame: within 1 day

    4 point scale (very clear, clear, unclear, very unclear)

  8. perceptions fo information provided (clarity of info about harm)

    Time frame: within 1 day

    4 point scale (very clear, clear, unclear, very unclear)

  9. perceptions fo information provided (info helpful?)

    Time frame: within 1 day

    4 point scale (very helpful, helpful, unhelpful, very unhelpful)

  10. perceptions fo information provided (share info with others?)

    Time frame: within 1 day

    4 point scale (definitely yes, probably yes, probably no, definitely no)

  11. Decisional conflict (hard to make decision)

    Time frame: within 1 day

    4 point LIkert scale (strongly agree, agree, disagree, strongly disagree)

  12. Decisional conflict (made informed decision)

    Time frame: within 1 day

    4 point LIkert scale (strongly agree, agree, disagree, strongly disagree)

  13. Decisional conflict (satisfied with decision)

    Time frame: within 1 day

    4 point LIkert scale (strongly agree, agree, disagree, strongly disagree)

Sponsors and collaborators

Lead sponsor

Trustees of Dartmouth College

Other

Collaborators

  • Norwegian Institute of Public Health

Registry information

Official study title

Communicating Uncertainty About the Effects of Wearing Glasses to Reduce the Chance of Getting COVID (Corona Virus Disease): Protocol for a Randomized Trial

Important dates

Study start
2022
Primary completion
2023
Study completion
2023
First posted
Dec 8, 2022
Registry last updated
May 22, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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