Maternal background characteristics of live singleton births in the study population in Iceland between November 29th 2004 and December 31st 2012.

*Based on one-way ANOVA.**Based on chi-square test.*** Of those diagnosed with pregnancy-induced hypertensive disorder 48; 16; 15; 10; 15 were both diagnosed with gestational hypertension and preeclampsiaIncluded in the collapse groups are women with singleton pregnancies with gestational length of 20 weeks or more during aSeptember 27th 2004–September 28th 2008, bSeptember 29th 2008 –September 27th 2009, cSeptember 28th 2009 –October 3rd 2010, dOctober 4th 2010 –October 2nd 2011, eOctober 3rd 2011 –October 1st 2012.Maternal background characteristics of live singleton births in the study population in Iceland between November 29th 2004 and December 31st 2012.