- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04644328
The Doctors for Coronavirus Prevention Project Thanksgiving / Christmas Messaging Campaign
Study Overview
Status
Conditions
Detailed Description
The investigators used Facebook ads to show a 20 second video clip recorded by Massachusetts General Hospital, Harvard and Lynn Community health center doctors (6 people in all) to approximately 20,000,000 Facebook users. The ads will be shown before the Thanksgiving and Christmas holiday and will focus on staying safe - limiting travel and mask-wearing. The investigators will randomize exposure to the ad campaign at the ZIP code or county level to ask:
Do the videos change mobility and Thanksgiving and Christmas holiday travel? Do they reduce the spread of COVID-19?
Are there spillover impacts from the video messages? For example, if individuals decide to stay home, then do the geographical regions that tend to be visited by people from treated areas experience any effects, either through information spillovers or through a reduction in travel?
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
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Massachusetts
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Cambridge, Massachusetts, United States, 02138
- JPAL North America
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-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Individuals viewing the ads must be Facebook users, 18 years and older. Facebook will decide specifically which users receive the messages within a target geographical area (zip or county).
Exclusion Criteria:
-
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Sequential Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: High-Intensity Treatment Arm
Treatment: Individuals received approximately 3 Facebook ads over a 2-week period. Each ad contained a short video recorded by a physician using a script that discusses staying safe during the holidays by considering not traveling and using a mask when appropriate. Randomization to treatment: The 13 states which centrally report COVID-19 cases at the ZCTA level contained 829 counties. At Thanksgiving, 9 counties were excluded due to data limitations. At Christmas, 62 counties were excluded due to data limitations and potential negative impacts in rural, conservative areas resulting from polarization in the wake of the 2020 presidential election. Approximately half of the counties were randomized to high-intensity treatment with the remaining randomized to low-intensity treatment. In high-intensity counties, 3/4 of ZCTAs were treated (i.e., Facebook users in those ZCTAs received ads) and 1/4 were not. In low-intensity counties, 1/4 of ZCTAs were treated and 3/4 were not. |
Facebook ads to show a 15 second video clip recorded by MGH, Harvard and Lynn Community health center and other health care professionals.
The ads will be shown before the Thanksgiving/Christmas holiday and will focus on staying safe - limiting travel and mask-wearing.
The investigators will randomize exposure to the ad campaign at the ZIP code or county level.
|
No Intervention: Low-Intensity Control Arm
Control: Individuals did not receive ads containing short physician-recorded videos. Randomization to treatment: The 13 states which centrally report COVID-19 cases at the ZCTA level contained 829 counties. At Thanksgiving, 9 counties were excluded due to data limitations. At Christmas, 62 counties were excluded due to data limitations and potential negative impacts in rural, conservative areas resulting from polarization in the wake of the 2020 presidential election. Approximately half of the counties were randomized to high-intensity treatment with the remaining randomized to low-intensity treatment. In high-intensity counties, 3/4 of ZCTAs were treated (i.e., Facebook users in those ZCTAs received ads) and 1/4 were not. In low-intensity counties, 1/4 of ZCTAs were treated and 3/4 were not. |
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Facebook Movement Metric
Time Frame: November 26, 2020 (Thanksgiving); December 24-25, 2020 (Christmas); February 2-29, 2020 (Baseline benchmark)
|
The change in movement metric is the percent change in distance covered in a day compared to the same day of the week in the benchmark period of February 2-29, 2020, by people who started the day in a particular location.
We define holiday travel as travel during the three days preceding each holiday, since the available data does not allow us to compute the impact of the intervention on the return travel (after the holiday).
The reason is that the mobility data describes the behavior throughout the day, for people who were in each county that morning.
Since the campaign was targeted based on home location, we can only capture its impact on travel away from home, not back home.
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November 26, 2020 (Thanksgiving); December 24-25, 2020 (Christmas); February 2-29, 2020 (Baseline benchmark)
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Percentage Leaving Home on Day of Holiday
Time Frame: November 26, 2020 (Thanksgiving); December 24-25, 2020 (Christmas)
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The Facebook stay put metric is the percentage of people who stay within a small geographical area (a "tile" of 600m*600m in which they started the day).
We use it to compute the share of people leaving home on the day of the holiday (i.e. this variable = 1 - stay put on the day of the holiday).
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November 26, 2020 (Thanksgiving); December 24-25, 2020 (Christmas)
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Inverse Hyperbolic Sine of COVID-19 Cases
Time Frame: December 1-14 (Thanksgiving arms) and January 1-14 (Christmas arms)
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Inverse hyperbolic sine of COVID-19 cases during a 14 day period starting 5 days after each holiday
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December 1-14 (Thanksgiving arms) and January 1-14 (Christmas arms)
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Knowledge of COVID-19 Prevention Message (Recall of ad, Intent to Travel, Mask Wearing and Beliefs About Travel)
Time Frame: up to one month
|
Facebook will ask a set of users in treated zip codes to answer four survey questions (each user answers only one question each).
A small within-zip control group will be held from being treated, enabling comparisons between those who see the videos and those who don't.
These questions will be asked a few days after the ad is shown on the User's feed and will include 1) recall of the ad; 2) intention of traveling over holiday; 3) intention of wearing a mask; and 4) beliefs about whether people should travel over holiday.
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up to one month
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Average Number of Tiles People Occupy (Mobility Measure)
Time Frame: up to one month
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this measures each day "how much people move around by counting the number of level-16 Bing tiles they are seen in within a day.
People seen in more tiles are probably moving around more, while people seen in fewer are probably moving around less.
Each day take eligible people in a given region and compute the number of distinct tiles they were seen in."
This is aggregated to the county level.
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up to one month
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Percentage of Eligible Participants Only Observed in a Single Level-16 Bing Tile (no Change in Movement)
Time Frame: up to one month
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Facebook "Stay-put" data: this measures each day "the percentage of eligible people who are only observed in a single level-16 Bing tile (600m x 600m) during the course of a day" aggregated to they county level.
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up to one month
|
Collaborators and Investigators
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 2003000118A010
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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