INS and gestational diabetes: Similarly, in a study conducted on Japanese women, it has been shown that 1-h PG levels during an OGTT at diagnosis of GDM were significant predictors for both the need for insulin therapy in pregnancy and postpartum IGT (1 h: OR, 1.023; 95% CI, 1.009–1.037; P = 0.001; 1 h: OR, 1.027; 95% CI, 1.004–1.050; P=0.002, respectively) (16).