Margaret A.WinkerMD, Deputy EditorIndividualAuthorPhil B.FontanarosaMD, Interim CoeditorIndividualAuthor
To the Editor: Dr Hoekstra and
colleagues1 report a positive relationship between voucher
incentives offered in the Special Supplemental Nutrition Program for
Women, Infants, and Children (WIC) and childhood immunization rates.
However, the conclusions are biased because the interventions lack
clarity, the methods used for calculating outcomes vary, and the
analysis failed to control for potential confounders.
Golden R. Voucher Incentives to Increase Childhood Immunization Rates. JAMA. 1999;281(8):702-703. doi:10-1001/pubs.JAMA-ISSN-0098-7484-281-8-jbk0224