【Conclusion】
Our finding shows that vitamin D “deficiency” and “insufficiency” during pregnancy diagnosed according to the existing “50 nmol/L” and “30nmol/L” are not associated with adverse pregnancy outcomes we concerned. Moreover, there is no larger population study to prove that higher levels of vitamin D in pregnancy can lead to better outcomes.
Acknowledgements
This work was supported by a grant from Natural Science Foundation of Guangdong Province, China (2020A1515010061 to Dr. Qiong Lei). Dr. Qiong Lei are the guarantor of this work and, as such, had full access to all data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Yanqiang Hao contributed much in collecting data at the very beginning of the study.