Résumé :
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[BDSP. Notice produite par INIST 6R0xE5aU. Diffusion soumise à autorisation]. Context Little is known about the extent of extraimmunization, ie, vaccine doses given in excess of the recommended schedule, and whether it should be a public health concern. Objectives To determine the extent and cost of extraimmunization in children and to identify its associated factors. Design, Setting, and Participants United States 1997 National Immunization Survey, in which telephone interviews were conducted with parents of 32 742 19-to 35-month-old children and vaccination histories were collected from health care providers for 22 806 of these children (overall response rate, 68.5%). Estimates were weighted to represent the full sample. Main Outcome Measures Frequency of extraimmunization compared by vaccine type as well as with adequate immunization ; factors associated with extraimmunization ; and vaccine and visit costs associated with extraimmunization. Results Frequency of extraimmunization was less than 5% for each vaccine considered except poliovirus (14.1%). Overall, 21% of children were extraimmunized for at least 1 vaccine vs 31% underimmunized for at least 1 vaccine. In a multivariate model, the strongest contributors to extraimmunization were having more than 1 immunization provider (odds ratio [OR], 2.8 ; 95% confidence interval [CI], 2.4-3.2) and having multiple types of providers (eg, private and public health department ; OR, 2.0 ; 95% CI, 1.6-2.4). (...)
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