Objectives. We compared completion rates for adolescent immunization series administered at school-based health centers (SBHCs) to completion rates for series administered at community health centers (CHCs) within a single integrated delivery system.Methods. We performed a retrospective analysis of data from an immunization registry for patients aged 12–18 years. Patients were assigned to either an SBHC or a CHC during the study interval based on utilization. We used bivariate analysis to compare immunization series completion rates between the 2 groups and multivariate analysis to compare risk factors for underimmunization. We performed subanalyses by ages 12–15 years versus ages 16–18 years for human papillomavirus (HPV) and for the combination of HPV; tetanus, diptheria, and pertussis (Tdap); and tetravalent meningococcus virus.Results. SBHC users had significantly higher completion rates (P < .001) for hepatitis B, Tdap, inactivated poliovirus, varicella, measles/mumps/rubella, and HPV for ages 16–18 years, and for the combination of HPV, Tdap, and MCV4 for ages 16–18 years. CHC users had higher completion rates for tetanus and diphtheria.Conclusions. SBHCs had higher completion rates than did CHCs for immunization series among those aged 12–18 years, despite serving a population with limited insurance coverage.
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