Brian S. Hooker and Neil Z. Miller

The aim of this study was to compare the health of vaccinated versus unvaccinated pediatric populations.

… based on a convenience sample of children born into one of three distinct pediatric medical practices, higher ORs were observed within the vaccinated versus unvaccinated group for developmental delays, asthma and ear infections. No association was found for gastrointestinal disorders in the primary analysis, but a significant relationship was detected in the third and fourth quartiles (where more vaccine doses were administered), at the 6-month cut-off in the temporal analysis, and when time permitted for a diagnosis was extended from children⩾3years of age to children ⩾ 5 years of age.

… A thorough evaluation of vaccinated versus unvaccinated populations is essential to understanding the full spectrum of health effects associated with specific vaccines and the child- hood vaccine schedule in totality.