^aAll costs use market purchase-weighted prices estimated using 1999–2002 price data as described in Chapter 5—Evaluation of Cost. Data on number of participants were obtained from 2002 (Bartlett et al., 2003).

^bSee footnote b for Table E-5.

^cThe committee used data provided by FNS (public communication during open session, February, 2004, J. Hirschman, Office of Analysis, Nutrition and Evaluation, Food and Nutrition Service, USDA) to estimate that the average post-rebate cost of formula was 32.1%of the pre-rebate cost in 2002.

^dPercentage of infants fully breast-fed at 3 mo of age was reported (CDC, 2004b, 2004c). Percentage of partially breast-fed infants was calculated from these data and data on the percentage of infants who had ever been breast-fed at 3 mo of age (CDC, 2004b, 2004c).

^eNumber of participants was calculated using data Exhibit 3.1 from USDA’s WIC Participant and Program Characteristics, 2002 (Bartlett et al., 2003), recognizing that some discrepancies exist in these data. An infant is defined as a participant who, at certification, is under 1 year of age and who would be classified as a child at the age of 366 d. However, in 2002, about 2.84% of WIC participants categorized as 1-y-old children are, in fact, 11-mo-old infants who have been recertified as 1-y-old children; additionally, about 0.38% of WIC participants who are classified as infants are participants who are older than 366 d.

^fPercentage of infants fully or partially breast-fed at 4–5.9 mo of age was extrapolated