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In model 3, a diagnosis of diabetes mellitus or preeclampsia recorded during the current pregnancy was added as a covariate to those included in model 2.

In model 4, SGA or LGA at birth was added to the covariates included in model 3.

A discrepancy in days was defined as the EDD by LMP minus the EDD by US.

Negative discrepancy was defined as the EDD by LMP earlier than the EDD by US; that is, a more advanced GA estimated by LMP than by US.

All data were retrieved from the national Medical Birth Register and the Swedish Patient Register, in which information is prospectively recorded and of good quality.In model 1, we adjusted for body mass index (BMI, weight (kg)/height (m30 years, smoking or snuff use, living without a partner, and not being employed.In model 2, fetal sex was added to the first model with female as the reference category.The fetus was therefore smaller than expected when dated by US, and the EDD was postponed.Positive discrepancy was defined as the EDD by LMP later than the EDD by US, which corresponded to a less advanced GA estimated by LMP than by US.

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