Characteristics of 953 pregnant women in the Norwegian Mother and Child Cohort study, Norway, 2003–2007.

<p>Means were compared with two samples T-test if not stated otherwise.</p>a<p>Glomerular filtration rate estimated by Cockroft-Gault (CG) formula.</p>b<p>Glomerular filtration rate estimated by modification of diet in renal disease (MDRD) formula.</p>c<p>Glomerular filtration rate estimated by Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula.</p><p>*Mann-Whitney U-test.</p><p>**Chi-square test.