LAUSR

OBJECTIVES To assess the effectiveness of distinct message types in promoting coronavirus disease 2019 (COVID-19) vaccination intentions for parents of children and adolescents. METHODS We collected data through the Voices of Child Health in Chicago Parent Panel Survey from October to November 2021. Parents were randomly assigned to read 1 of 4 vaccine message types and then report their intentions to vaccinate each COVID-19-unvaccinated child (0-17 years) in their household (n= 1453). RESULTS The sample included 898 parents. Compared with a control group (37.5%), the proportion of parents who were very likely to vaccinate their children was higher when messages highlighted that other trusted parents have vaccinated their children (53.3%) or that the vaccine is safe and thoroughly tested (48.9%) but not when messages highlighted that the vaccine is well-tolerated (41.5%). After adjusting for parent and child characteristics, the odds of being very likely to vaccinate remained higher in the trusted parents group but not in the safe/thoroughly tested group. Unlike the control and well-tolerated groups, there were no racial/ethnic disparities in the unadjusted proportion of parents who were very likely to vaccinate in the trusted parents and safe/thoroughly tested groups. Message types affected the unadjusted proportion of COVID-19-unvaccinated parents who were very likely to vaccinate their children. CONCLUSIONS Messages that focus on trusted parents choosing to vaccinate their children were more effective at promoting parents' COVID-19 vaccination intentions for their children than alternative messages. These findings have implications for public health messaging and pediatric providers' communications with parents.