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Resource | Research and Data | Participation Rates WIC Eligibles and Coverage-2000 to 2009: National and State-Level Estimates of the Population of Women, Infants and Children Eligibles for WIC Benefits

This report offers updated estimates of the population that met these criteria and was eligible for WIC benefits in each of the years 2000 through 2009. This report includes some new estimates not included in previous reports: (1) estimates of the number of eligibles and coverage rates by state; (2) updated estimates in U.S. territories; (3) confidence intervals; and (4) estimates of eligible children by single year of age.

12/01/2011
Resource | Research and Data | Payment Accuracy and Program Integrity 2005 WIC Vendor Management Study

In 1991 and 1998, FNS conducted national studies of WIC vendors to determine the extent of vendor violation of program rules. After the 1998 study, FNS issued regulations to correct vendor practices. The 2005 study replicates the 1998 study to determine whether the regulations were effective, and to measure the frequency of vendor violations and the degree to which vendors charge accurate prices for WIC transactions.

04/27/2007
Resource | Research Reports | Assessing/Improving Operations WIC Participant and Program Characteristics 2002

The WIC Participant and Program Characteristics (PC 2004) report summarizes demographic characteristics of WIC participants nationwide in April 2004, along with information on participant income and nutrition risk characteristics. A national estimate of breastfeeding initiation for WIC infants is included. The report also describes WIC members of migrant farm-worker families.

09/01/2003
Resource | Research and Data | Payment Accuracy and Program Integrity A Comparison of WIC Vendor Management Practices in 1991 and 1998

FNS published “The WIC Vendor Management Study, 1998” in July 2001 which examined, in part, the extent to which retail grocers, defined as WIC “vendors” were violating program rules and regulations. The 1998 study is a follow-up to the “WIC Vendor Issues Study, 1991” published by FNS in May 1993. 

05/01/2003
Resource | Research and Data | Payment Accuracy and Program Integrity Survey of the Public Health Nutrition Workforce 1999-2000

The Association of State and Territorial Public Health Nutrition Directors, with support from a cooperative agreement with USDA, conducted a census of the professional and paraprofessional public health nutrition workforce in the states and territories. ASTPHND has conducted periodic profiles of the public health nutrition workforce since 1985. Members of ASTPHND in their respective states and territories conducted the census reported in this paper during 1999-2000. Prior to this, ASTPHND's last survey was conducted in 1994.

01/02/2003
Resource | Research and Data | Payment Accuracy and Program Integrity WIC Vendor Management Study - 1998

The purpose of the study was to learn the extent to which retail grocers, defined as "vendors" in the WIC Program, authorized to provide food to WIC participants, were violating program rules and procedures, and to determine which programmatic and/or demographic variables could be associated with vendor violations.

07/01/2001
Page updated: September 16, 2025