INS and gestational diabetes: Based on the OR for macrosomia (> 4 kg), respiratory distress, preterm delivery and elective/emergency caesarean section reported in a recent meta-analysis for GDM women not using insulin, considering a relative precision of 50%, confidence level of 95%, and the rates of these outcomes resulted in this pilot study, a minimum sample size of 243 is required to explore the correlation of CGM data with at least one of these outcomes (caesarean section) (Additional file 4).