Confounding effect of ethnic diversity on booking-in body mass index and prevalence of gestational diabetes and hypertensive disorders in pregnant women in western Sydney 1997-2016.

Western Sydney booking-in BMI fluctuated between 1997 and 2016, reaching its peak in 2006. Despite this, rates of GDM progressively rose, with one in six mothers in western Sydney now diagnosed with some form of the condition. Both patterns are associated with a notable shift in the ethnic profile of patients booking-in to antenatal care in the region.