GREM1 and gestational diabetes: Furthermore, a univariate ANCOVA correcting for week of gestation resulted in no significant differences (corrected meanLOG10(NGT) = 0.704 ± 0.085, meanLOG10(GDM) = 0.603 ± 0.088; p = 0.239) in Gremlin-1 levels between NGT and GDM at GW 24–28.