Figure 4.

Effect of the revised food package from the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC) on nutrient density at 1 month postpartum, in a sample drawn from the Conditions Affecting Neurocognitive Development and Learning in Early Childhood study, a cohort of women recruited during pregnancy, Tennessee, 2006–2011. Difference-in-differences analysis was conducted by carrying out multivariable linear regressions adjusting for covariates listed in Table 1. The values above represent the coefficient on the term for interaction between WIC receipt during pregnancy and whether the pregnancy occurred after the revisions to the food package were implemented in October 2009; these coefficients capture the effect of the revised WIC food package on each of the outcomes of interest. Nutrient density outcomes represent grams of each nutrient × 1,000 divided by the total kcal of dietary intake per day. Missing values were imputed using multiple imputation using chained equations (see Web Appendix 1). CI, confidence interval.