COVID-19 Vaccinations With a Sweepstakes

NCT04951310 | Completed Results

• 1 other identifier: 849044
• Study Type: interventional
• Target: 3,827,656
• Locations: 1 country
• Sites: 1

Brief Summary

To reach herd immunity for COVID-19, experts estimate that 70% of the population will need to be vaccinated. However, vaccination rates have begun to slow down in the United States. The investigators will partner with Philadelphia to launch a COVID-19 vaccination sweepstakes, in which residents will be eligible to win if they have received at least one dose of the COVID-19 vaccine prior to a given drawing. Drawings will be held every two weeks; multiple prizes of various sizes will be awarded in each drawing. Half of the prizes in each size category in each drawing will be awarded to residents of a zip code that is randomly selected from a pre-defined list of under-vaccinated zip codes (this zip code will be announced at the start of each 2-week drawing period), the other half will be awarded to residents outside of that selected zip code. The investigators will analyze vaccination rates in Philadelphia as compared with neighboring regions before, during, and after the specified time period, as well as analyze vaccination rates in the three selected zip codes compared to the other zip codes that could have been targeted (the residual set of under-vaccinated zip codes) to determine the effectiveness of the sweepstakes at encouraging vaccinations.

Conditions

Covid19

Keywords

COVID19 vaccination; Behavioral science interventions; Vaccination promotion

Outcome Measures

Primary Outcomes (1)

• Weekly Vaccinations Per 100k Residents

  The primary outcome is the weekly vaccinations (per 100k residents) for residents receiving a first dose of a COVID-19 vaccination in each zip/county/city, relative to the control group. The vaccination data was measured by local health departments and the residency data was measured by the U.S. Census. The investigators included data from 5 weeks of pre-intervention, 6 weeks of intervention, and 4 weeks of post-intervention. Weekly Vaccinations per 100k Residents = 100,000 \* Total residents receiving a first dose that week / Total residents in that zip/county/city code as measured by the Census or other official sources, at the most recent date available for all geographies of interest.

  15 Weeks

Study Arms (3)

Control

NO INTERVENTION

No Intervention: Control participants (residents of Bucks County, Montgomery County, Delaware County, and Allegheny County, PA) are not eligible for the sweepstakes.

Selected Zip Code Treatment

EXPERIMENTAL

Selected Zip Code Treatment participants will have a significantly greater chance to win a prize in the sweepstakes than all other Philadelphia residents. Half of all prizes in every drawing will go to Philadelphia residents in the selected zip code.

Behavioral: Philly Vax Sweepstakes

All other Philadelphia Residents Treatment

EXPERIMENTAL

All other Philadelphia Residents Treatment participants will be eligible for the sweepstakes. Half of all prizes in every drawing will go to Philadelphia residents outside of the selected zip code.

Behavioral: Philly Vax Sweepstakes

Interventions

Philly Vax Sweepstakes BEHAVIORAL

The "Philly Vax Sweepstakes" is a citywide sweepstakes designed to motivate Philadelphians to get vaccinated against COVID-19. A total of 36 vaccinated Philadelphians will win among three cash prize packages, distributed from the total cash pool. These 36 will be chosen over three drawings, with 12 residents chosen in each drawing.

All other Philadelphia Residents Treatment; Selected Zip Code Treatment

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• All 18+ residents of the City of Philadelphia will be eligible. Residents will be able to win the sweepstakes prizes if they can verify they received at least one dose of the COVID-19 vaccine before the date of the sweepstakes drawing in question.

You may not qualify if:

• None.

Sponsors & Collaborators

• University of Pennsylvania: lead
• Philadelphia Department of Public Health: collaborator

Study Sites (1)

University of Pennsylvania

Philadelphia, Pennsylvania, 19104, United States

Location

MeSH Terms

Conditions

COVID-19

Condition Hierarchy (Ancestors)

Pneumonia, Viral; Pneumonia; Respiratory Tract Infections; Infections; Virus Diseases; Coronavirus Infections; Coronaviridae Infections; Nidovirales Infections; RNA Virus Infections; Lung Diseases; Respiratory Tract Diseases

Results Point of Contact

• Title: Dr. Katherine Milkman
• Organization: University of Pennsylvania

bcfg@wharton.upenn.edu

215-573-9646

Publication Agreements

• PI is Sponsor Employee: Yes

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 16, 2021
• First Posted: July 6, 2021
• Study Start: June 7, 2021
• Primary Completion: August 14, 2021
• Study Completion: August 14, 2021
• Last Updated: February 3, 2025
• Results First Posted: February 3, 2025

Record last verified: 2025-01

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)