MBRNMedical Birth Registry of Norway
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To be included in the present study, women must have completed the first questionnaire and have MBRN data available.
Parity was classified based on data from both MoBa and MBRN and categorized as primiparous or multiparous.
This was not practically possible, since information about which maternity unit obstetricians work in is not available, either in MBRN, or from other sources in Norway, as far back as the 1970s and 1980s.
For the present analysis we considered as potentially eligible all women with baseline questionnaire and MBRN data for the first pregnancy in which they were enrolled in MoBa [n - 85,910).
Women classified by the MBRN with unspecified diabetes before or during pregnancy were excluded from the analysis of T2DM and GDiM.
The latter analysis was conducted among the subset of women born in 1967 (when the MBRN was established) or later, with available birth weight (88% of 70,539).
Excluding women with nonconfirmed hypertension [reported only in the baseline questionnaire or MBRN (n = 351)] did not materially change the association with hypertension, so they were included in the analyses.