Effects of Participation in the WIC Program on Birthweight: Evidence From the National Longitudinal Survey of Youth
By Kowaleski-Jones L, Duncan G
Objectives: This study sought to estimate the impact on birthweight of maternal participation in the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC).
Methods: WIC estimates were based on sibling models incorporating data on children born between 1990 and 1996 to women taking part in the National Longitudinal Survey of Youth.
Results: Fixed-effects estimates indicated that prenatal WIC participation was associated with a 0.075 unit difference (95% confidence interval [CI] = -0.007, 0.157) in siblings’ logged birthweight. At the 88-oz (2464-g) low-birthweight cutoff, this difference translated into an estimated impact of 6.6 oz (184.8 g).
Conclusion: Earlier WIC impact estimates may have been biased by unmeasured characteristics affecting both program participation and birth outcomes. Our approach controlled for such biases and revealed a significant positive association between WIC participation and birthweight.
March 19, 2018
Kowaleski-Jones L, Duncan G (2002) Effects of Participation in the WIC Program on Birthweight: Evidence From the National Longitudinal Survey of Youth. American Journal Of Public Health: Vol. 92, Issue 5, pp. 799-804. Available online: https://ajph.aphapublications.org/doi/abs/10.2105/AJPH.92.5.799