Figure 6
From: New insights into the vitamin D requirements during pregnancy
LOESS curve of 25(OH)D concentration and gestational age (weeks) at birth to show the change in average behavior with 1 and 2 s.d. windows superimposed (NICHD and TRF, n=509). Black line represents fitted LOESS curve; dark gray area represents 1 s.d.; and light gray area represents 2 s.d. Multivariable log-binomial regression found that 25(OH)D concentrations >40 ng·mL−1 reduces the risk of preterm birth by 59% compared to <20.0 ng·mL−1, adjusted for covariates. NICHD, National Institute of Child Health and Development. Reproduced with permission from Wagner et al.104
