Multivariate analysis demonstrated a substantial increase in the incidence of GDM/DM treated with insulin (age 35–39 years: aOR 2.04; 95% CI, 1.89–2.20 and age ≥ 40 years: aOR 3.21; 95% CI, 2.90–3.56), hypertensive disorder treated with magnesium during pregnancy (age 35–39 years: aOR 1.60; 95% CI, 1.34–1.90 and age ≥ 40 years: aOR 1.62; 95% CI, 1.23–2.13), and cesarean delivery (age 35–39 years: aOR 1.57, 95% CI, 1.54–1.59; age ≥ 40 years: aOR 2.59, 95% CI, 2.52–2.67). Here, INS is linked to diabetes mellitus.