N/A
Completed N=3,827,656
COVID-19 Vaccinations With a Sweepstakes
Source: ClinicalTrials.gov NCT04951310 ↗Enrolled (actual)
3,827,656
Serious AEs
0.0%
Results posted
Feb 2025
Primary outcomePrimary: Weekly Vaccinations Per 100k Residents — 0; -4; 383 Weekly Vaccinations per 100k Residents
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.
Outcome Measures
| Outcome | Result | p-value |
|---|---|---|
| PRIMARY Weekly Vaccinations Per 100k Residents |
0; -4; 383 | — |
Eligibility Criteria
Inclusion Criteria
- 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.
Exclusion Criteria
- None.
Data sourced from ClinicalTrials.gov (NCT04951310). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication. Informational only — not medical advice.