title: A retrospective cohort study of risk factors for missing preschool booster immunisation.
abstract: OBJECTIVE
  To identify factors associated with non-uptake of preschool booster immunisation.
  
  
  METHODS
  Data from the computerised child health system was used to study all children born in 1990 and living in South Glamorgan, Wales, on their 5th birthday. Factors associated with preschool booster uptake were investigated using multiple logistic regression.
  
  
  RESULTS
  Preschool booster coverage in the study cohort was 91.4%. After adjustment for other variables, uptake was associated most strongly with completed primary immunisation for diphtheria, tetanus, and polio vaccine or first dose measles, mumps, and rubella vaccine. Identifying children who miss either of these predicts 52.4% of those who miss the preschool booster.
  
  
  CONCLUSIONS
  Effective targeting of children who have missed previous immunisations could improve preschool booster uptake and ensure maximum uptake of at least one dose of measles, mumps, and rubella vaccine. Achieving optimum measles vaccine coverage is vital to achieve the goal of measles elimination.
authors.affiliation: Bro Taf Health Authority, Cathays Park, Cardiff, UK. mre@abton4.demon.co.uk
authors.forename: M R
authors.initials: MR
authors.lastname: Evans
authors.forename: D R
authors.initials: DR
authors.lastname: Thomas
mesh_terms: D002675:Child, Preschool; D015331:Cohort Studies; D015721:Diphtheria-Tetanus-Pertussis Vaccine; D005260:Female; D006801:Humans; D007115:Immunization Schedule; D007117:Immunization, Secondary / Q000523:psychology* / Q000706:statistics & numerical data; D008297:Male; D008458:Measles Vaccine; D022542:Measles-Mumps-Rubella Vaccine; D009108:Mumps Vaccine; D010342:Patient Acceptance of Health Care / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012307:Risk Factors; D012411:Rubella Vaccine; D016312:Treatment Refusal; D017778:Vaccines, Combined; D014852:Wales
chemical_list: D015721:Diphtheria-Tetanus-Pertussis Vaccine; D008458:Measles Vaccine; D022542:Measles-Mumps-Rubella Vaccine; D009108:Mumps Vaccine; D012411:Rubella Vaccine; D017778:Vaccines, Combined