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The Distribution of prenatal VMR, a new candidate biomarker for vitamin D status in the BIPS study (N = 89). Women with PPD had lower VMR (0.087 ± 0.017) than women without PPD (0.012 ± 0.023), p = 0.003. BIPS, Behavior In Pregnancy Study; PPD, postpartum depression; VMR, Vitamin D Metabolite Ratio.
