The independent factors associated statistically significantly with GDM include: (1) High blood pressure before pregnancy increases 4.1 times the rate of GDM, with PR = 4.1; 95% CI (1.8 to 9.9); p = 0.001; (2) History of GDM increases 5.4 times the rate of GDM, with PR = 5.4; 95% CI (2.5 to 11.8), p <0.001; (3) Family history with first - generation family members having diabetes increases 2.6 times the GDM rate, with PR = 2.8; 95% CI (1.5 to 5.5), p = 0.002.