Lazariu-Bauer V, et al. A comparative analysis of effects of early versus late prenatal WIC participation on birthweight: NYS, 1995. Matern Child Health J. Jun 2004;8(2):77-86.
The researchers examined the effects of prenatal participation in the New York State WIC Program on birthweight through enhanced control of selection bias and gestational age bias. Adjusted estimates showed a significant positive effect of longer prenatal WIC participation on birth outcomes for all of the groups studied.