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Effects of participation in the WIC program on birthweight: Evidence from the National Longitudinal Survey of Youth

Author

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  • Kowaleski-Jones, L.
  • Duncan, G.J.

Abstract

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.

Suggested Citation

  • Kowaleski-Jones, L. & Duncan, G.J., 2002. "Effects of participation in the WIC program on birthweight: Evidence from the National Longitudinal Survey of Youth," American Journal of Public Health, American Public Health Association, vol. 92(5), pages 799-804.
    • Handle: RePEc:aph:ajpbhl:2002:92:5:799-804_3
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