FGF21 and gestational diabetes: Results of subgroup analyses by diagnostic criteria demonstrated that, in the group based on 75 g OGTT criteria, GDM-affected pregnant women had considerably greater levels of circulating FGF21 than healthy expectant mothers (p = 0.004), but in the group based on 100 g OGTT criteria, FGF21 levels did not significantly differ between the case and control groups (p = 0.684).