The rates for gestational diabetes, on the other hand, have remained steady. While the most common number cited for gestational diabetes is about 8%, this study found 7.5% in 1999 and 7.4% in 2005.
The highest incidence of diabetes was found in teenage moms aged 13 to 19 years old, a group in which the incidence increased fivefold over the course of the study.
Diabetes also doubled among women aged 20 to 39 and increased by 40 per cent among those women 40 and older.
These numbers fit with the tremendous increase in diabetes in North American society, but they also point out that gestational diabetes is still about 5 times more common.
Diabetes diagnoses before motherhood have doubled