Ryan AS, Zhou W, Gaston MH. Regional and sociodemographic variation of breastfeeding in the United States, 2002. Clin Pediatr (Phila). Nov/Dec 2004;43(9):815-824.
The authors analyzed data from the Ross Mothers Survey rates for breastfeeding in the hospital and at 6 months within four geographic regions of the US. The results showed that college education and non-participation in the WIC Program were the strongest predictors of breastfeeding in the hospital.