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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 1. 25(OH)D concentration within 6 weeks of delivery by gestational age (weeks) at birth (NICHD & TRF, N=509).

Figure 1

Term birth is ≥37 weeks of gestation; late preterm birth is 34 to <37 weeks; moderately preterm is 32 to <34 weeks; and very preterm is <32 weeks. White circles represent women assigned to the control group (400 IU/day); gray triangles represent women assigned to the 2000 IU/day treatment group; and solid black squares represent women assigned to the 4000 IU/day treatment group. Black line represents fitted LOESS curve.