In primiparous women, women in GDM group had high BMI, hemoglobin, HOMA-IR, FPG, and CRP values (all P < 0.05), and tended to be more likely to have family history of diabetes (P = 0.055) and history of PCOS (P = 0.065), compared with those without GDM; no other significant differences were observed between the two groups. Here, CRP is linked to polycystic ovary syndrome.