2.8. Estimation of nursing infant dietary intake
In order to evaluate the magnitude of exposure to pyrethroids by infants, the estimated daily intake (EDI) was calculated as EDIi = Ci F Mb where EDIi is the estimated intake [micrograms per kilograms of body weight (bw) per day], Ci is the median concentration of pyrethroid in milk samples (micrograms per grams of lipid weight), F is the lipid content in milk samples (grams of lipid per 100 g of milk) and Mb is the daily consumption of milk (grams per kilograms of body weight per day). The infant's average milk consumption (Mb), 175 g of milk (kg bw)− 1 day− 1, was calculated from US EPA recommendations (US EPA, 2002) by assuming an average daily intake breast milk rate of 702 mL of milk per day (723 g of milk per day) and a 1-month-old infant body weight of 4.14 kg. The mean value of lipid content in analyzed samples was used for F estimation, with a value of 4.4 g of lipid per 100 g of milk.