INS and gestational diabetes: The incidence of GDM increased from 3.86% in 2007 to 11.83% in 2010, with a continuous increase observed after adjustment for age (P < 0.001; Fig 1), but the proportions of GDM requiring insulin treatment among GDM decreased significantly from 13.87% in 2007 to 5.94% in 2010 (P < 0.001; Fig 1).