Parental Factors Associated With Measles-Mumps-Rubella Vaccination in US Children Younger Than 5 Years.

To determine the association between parental characteristics and MMR (measles-mumps- rubella) vaccination status of children in the United States. We conducted a cross-sectional study from July 2023 to April 2024 using a digital health survey via OutbreaksNearMe, weighted to target national population characteristics. We analyzed the responses of 19 892 parents of children younger than 5 years to examine the association between self-reported parental characteristics (i.