Associations between population based voting trends during the 2016 US presidential election and adolescent vaccination rates

Background: Politics play a role in the dissemination of public health information, including immunization-related issues. We aim to describe relationships between HPV vaccination rates and state voting patterns during the 2016 US presidential election.

Methods: We classified each of the 50 states as either "Red" or "Blue," based on whether a higher proportion of the state's casted votes were for the Republican or Democratic nominee during the 2016 US presidential election. State-specific HPV, Tdap, and meningococcal vaccination rates were obtained from the 2016-National Immunization Survey-Teen. State socio-demographic factors and HPV vaccine legislation were obtained from the US Census Bureau and National Conference of State Legislatures. Vaccination rates and socio-demographic variables were compared using independent t-tests. Multiple linear regression compared vaccination rates between "Red" and "Blue" states, adjusting for percentage of both uninsured children and educational attainment.

Results: Compared to "Blue" states, "Red" states had significantly lower unadjusted HPV vaccine series initiation (56% vs 66%, p < 0.05) and completion (39% vs 50%, p < 0.05) rates; yet had similar rates of Tdap (88% vs 89%, p > 0.05) and meningococcal (79% vs 83%, p > 0.05) vaccinations. After adjusting for potential confounders, the regression-adjusted mean rate for HPV vaccine initiation and completion remained significantly lower for "Red" states compared to "Blue" states (57% vs 65%, p < 0.05, and 41% vs 48%, p < 0.05, respectively).

Conclusion: HPV vaccination rates are associated with statewide-level voting patterns. Future interventions aimed at improving HPV vaccination rates should consider engaging local and national elected leaders to be proactive in disseminating accurate and authoritative immunization information.