Three-stage pattern of rapid increase, plateau, and subsequent decline in vitamin D concentration during pregnancy among Chinese women: a large-scale survey.

However, the study involving 4,368 Chinese pregnant women revealed that VitD concentrations gradually increased with gestational weeks during pregnancy ( 14 ); in contract, our present study observed a different pattern, where VitD concentrations remained relatively stable in pregnant women between 20 and 30 weeks after a rapid increase in the first 20 weeks, but displayed a decreasing trend in pregnant women beyond 30 weeks.

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