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16 November 2016 : Clinical Research  

The Correlation Between Serum Vitamin D Deficiency and Preterm Birth

Lixia YangBF, Shilei PanCG, Yufeng ZhouDG, Xiaoyang WangAE, Aikai QinAE, Yuxin HuangBF, Suxia SunAD

DOI: 10.12659/MSM.898117

Med Sci Monit 2016; 22:4401-4405

Abstract

BACKGROUND: Preterm birth is an important cause of death and developmental disorder in neonates. Vitamin D deficiency has been shown to regulate body inflammatory factor levels that stimulate elevation of uterine contraction hormones, such as prostaglandin, thus causing preterm birth. However, current observations regarding the relationship between vitamin D and preterm birth are inconsistent. We performed a nested case-control study to investigate the effect of vitamin D on preterm birth.

MATERIAL AND METHODS: A prospective cohort study included 200 cases of pregnant women in our hospital from May 2013 to May 2015. Blood samples were collected from early, middle, and late stages of pregnancy. Forty-six patients with preterm delivery were compared with age-matched full-term delivery cases (N=92). High performance liquid chromatography-mass spectrometry (HPLC-MS) was used to detect serum levels of 25(OH)D, 25(OH)D2, and 25(OH)D3. Logistic regression was performed to analyze the correlation between 25(OH)D and risk of preterm birth.

RESULTS: No significant difference in age, smoking/drinking, education level, BMI and vitamin D levels was found between the preterm birth group and full-term delivery group. No significant difference was found for vitamin D levels across different stages of pregnancy; no difference in concentration of 25(OH)D related to preterm birth risk was found. After adjusting for potentially confounding factors, serum vitamin D level did not increase the risk of preterm birth.

CONCLUSIONS: This study did not found evidence of an increase in preterm birth risk related to vitamin D level during pregnancy.

Keywords: Cohort Studies, Case-Control Studies, Dietary Supplements, Pregnancy, Pregnancy Complications - blood, Premature Birth - blood, Prospective Studies, Risk Factors, Vitamin D - blood, Vitamin D Deficiency - blood

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750