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A: At mid-gestation (23.3±3.6 weeks) the Ln(PTH, pg/mL) was inversely associated with the Ln(25(OH)D, ng/mL): p = 0.023, n = 91, r = −0.239. The untransformed relationship is presented for ease of interpretation. This relationship was maintained at delivery (data not shown: p = 0.019, n = 80, r = −0.261). B: Mid-gestation 25(OH)D concentrations were inversely associated with 1,25(OH)2D concentrations at delivery: p = 0.032, n = 95, r = −0.221.
