57,893
Participants
Start Date
December 8, 2022
Primary Completion Date
December 23, 2022
Study Completion Date
December 23, 2022
Messaging
Booster reminder message
Financial Incentive
Financial Incentive for getting boosted within 2-weeks of the message
Placebo
Treatment as usual; no additional message and no incentive.
Contra Costa Health Plan, Martinez
J-PAL North America
UNKNOWN
University of Southern California
OTHER