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Letters
February 24, 1999

Voucher Incentives to Increase Childhood Immunization Rates

Author Affiliations
 

Margaret A.WinkerMD, Deputy EditorIndividualAuthorPhil B.FontanarosaMD, Interim CoeditorIndividualAuthor

JAMA. 1999;281(8):702-703. doi:10-1001/pubs.JAMA-ISSN-0098-7484-281-8-jbk0224

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.

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