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Researchers retrospectively examined the ongoing issue of undervaccination and associated healthcare utilization patterns in 323,247 children born between 2004 and 2008 in eight managed care organizations in the U.S. Vaccination and utilization data were captured from electronic health records.
From 2004 to 2008, the prevalence of delayed (≥1 day) vaccination according to the Centers for Disease Control and Prevention schedule for the first 2 years increased significantly from 41.8% to 54.4%, and the mean delay increased significantly from 28 to 44 days. Parental choice was the reason for undervaccination in approximately 13% of children. Compared with a matched cohort of children with on-time vaccinations, undervaccinated children had signi…