There was a directly proportional correlation between mother and newborn umbilical cord 25(OH)D concentrations in PTNB ( r = 0.596 p < 0.001) and FTNB ( r = 0.765 p < 0.001). Newborns in the PTNB group also had lower 25(OH)D concentrations compared to FTNB group (25.9 ± 13.9 ng/dL vs. 26.2 ± 9.8 ng/mL p = 0.011) and were three times more likely to have insufficiency when compared to mothers in the FTNB group (OR = 2.993 95%CI 1.02–8.74). Mothers in the PTNB group had significantly lower mean 25(OH)D blood levels (21.7 ± 10.8 ng/mL vs. ![]() Ten milliliters of blood were drawn from the mothers and the umbilical cord of newborns at birth to identify the 25(OH)D, parathyroid hormone, calcium, phosphorus, and alkaline phosphatase concentrations. Data were collected on the characteristics of mothers (gestational age, diseases, and habits) and newborns (anthropometry and adequacy for gestational age). This cross-sectional study was conducted with 66 mothers who had given birth to preterm babies and their preterm newborns (PTNB, < 32 weeks), and 92 women who had given birth at the full-term of their pregnancy and their newborns (FTNB). This study aimed to describe the concentrations of 25(OH)D (25-hydroxyvitamin D) of mothers who delivered preterm newborns compared to women with full-term pregnancy deliveries, as well as to relate 25(OH)D blood concentrations of mothers with those of their newborns. Studies suggest an association between low vitamin D concentrations during pregnancy with intrauterine growth restriction and prematurity. More than half of pregnant women are affected by vitamin D insufficiency/deficiency. Vitamin D deficiency is a global public health issue.
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