In our study, independent factors related to risks of GDM were: (1) age ≥ 35 years-old with PR = 3.51 (CI 95% [1.16 - 10.59]; p = 0.026); (2) a history of macrosomic birth ≥ 4 kilograms (PR = 4.64; CI 95% [1.27 - 17.01]; p = 0.019); (3) BMI ≥ 25 before pregnancy (PR = 2.08; CI 95% [1.01 - 4.27]; p = 0.047).