Flow chart describing subjects in the study.

<p>GDM: gestational diabetes mellitus *Reasons for lost to follow-up: Offspring of women with diet-treated GDM: 50% did not respond, 26% refused to participate, 9% had emigrated, 6% had died, 4% did not show up and 5% had other reasons. Offspring from the background population: 42% did not respond, 33% refused to participate, 9% had emigrated, 4% had died, 8% did not show up and 4% had other reasons. **Included offspring of women with GDM: 61% (153/252) of all Nordic offspring, 52% (153/295) of eligible offspring. ***Included offspring of women from the background population: 52% (118/225) of all Nordic offspring, 46% (118/256) of eligible offspring.