Early age at menarche and the risk of gestational diabetes mellitus: a cohort study

To evaluate whether there is an association between age at menarche (AAM) and the risk of gestational diabetes mellitus (GDM). A retrospective cohort study was conducted, including 5390 pregnant women who were screened for GDM at Alexandra Hospital in Athens, Greece over a 15-year period (2000–2014). Maternal age, pre-pregnancy body mass index (BMI), height, family history of type 2 diabetes mellitus, parity, educational and smoking status, and AAM were recorded. The results were expressed as odds ratios (OR) with a 95