Advanced maternal age is a risk factor for both early and late gestational diabetes mellitus: The Japan Environment and Children's Study

AimsThis study investigated the association between maternal age and early and late gestational diabetes mellitus (GDM).MethodsIn total, 72,270 pregnant women were included in this prospective birth cohort study. Associations between maternal age and early GDM (diagnosed at ResultsHigher maternal age was associated with higher odds of early and late GDM (P‐value for trend ConclusionsHigher maternal age was associated with an increased risk of GDM regardless of when GDM was diagnosed. The association between maternal age and early GDM was similar to that between maternal age and late GDM.