BGLAP and gestational diabetes: Analysis of correlations of serum 25-OH-D with BMD and serum BTMs in GDM patients: Pearson’s correlation analysis was conducted to investigate the correlations of serum 25-OH-D with BMD and serum BTMs in GDM patients, and the results revealed that serum 25-OH-D was positively correlated with BMD (r =0.183, p<0.05) and negatively correlated with such BTMs as BALP, OC, PINP, and β-CTx (r =-0.255, -0.369, -0.204, -0.610; p<0.05, respectively).