%0 Report %A Humlum, Maria Knoth %A Morthorst, Marius Opstrup %A Thingholm, Peter Rønø %T Sibling Spillovers and the Choice to Get Vaccinated: Evidence from a Regression Discontinuity Design %D 2022 %8 2022 Feb %I Institute of Labor Economics (IZA) %C Bonn %7 IZA Discussion Paper %N 15109 %U https://www.iza.org/publications/dp15109 %X We investigate the effects of the introduction of a population-wide Human Papillomavirus (HPV) vaccination program on the vaccine take-up of the targeted group of 15-year-old girls and their older sisters. For identification, we rely on a regression discontinuity design and high-quality Danish administrative data to exploit that date of birth determines program eligibility. We find that the program increased the HPV vaccine take-up of both the targeted girls and their older sisters. While the direct effects of the program reduced vaccine-takeup inequality, the spillover effects, in contrast, contributed to an increase in vaccine take-up inequality. %K health investments %K health behavior %K peer effects %K sibling spillovers %K HPV %K vaccine %K health inequality