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. Author manuscript; available in PMC: 2017 Jan 6.
Published in final edited form as: J Steroid Biochem Mol Biol. 2015 Nov 10;155(Pt B):245–251. doi: 10.1016/j.jsbmb.2015.10.022

Figure 3. Comparison of preterm birth rates for Charleston County, South Carolina March of Dimes (CC-MOD) vs. NICHD & TRF combined cohort.

Figure 3

CC-MOD rates are the published average percent of preterm births among live births for 2009-2011 in Charleston County, South Carolina; 25(OH)D concentrations unknown (15). Combined cohort includes participants from 2 studies conducted in South Carolina (10, 12). Percent lower risk and p-value between CC-MOD and combined cohort with 25(OH)D ≥40 ng/mL.