Trial design
Following informed consent of all eligible participants at the initial clinic visit, randomization was achieved using opaque envelopes as a method of allocation concealment. Since this was a non-blinded trial, the CGM sensor to be used was clearly visible to both the study participant and research staff. The participants were allocated to the unblinded study group (Freestyle Libre) or the blinded group (Freestyle Libre Pro). The flow of the study clinic visit schedule is shown in Figure S1. There were 4 scheduled clinic appointments for all participants, and GDM was routinely screened for between 24-28 weeks with the 75-g 3- point oral glucose tolerance test (OGTT)18 (Figure S1).