Tianjin GDM Screening Project. Tianjin is the fourthlargest city in Northern China with over 13 million residents,and 4.3 million residents live in six central urban districts.All pregnant women who live in six urban districts haveparticipated in the universal screening for GDM since 1999[9, 12, 13] by using the World Health Organization (WHO)GDM criteria [14]. Following the WHO GDM screeningcriteria, all pregnant women at 26–30 gestational weeksparticipate in a 1-hour oral glucose tolerance test (OGTT)with 50 g glucose load. Women who had a glucose reading≥7.8mmol/L were invited to undergo a 2-hour OGTT witha 75 g glucose load at the Tianjin Women’s and Children’sHealthCenter.Allwomen confirming either diabetes (plasmafasting glucose ≥7mmol/L or 2-hour glucose ≥11.1mmol/L)or impaired glucose tolerance (IGT) (2-hour glucose ≥7.8and <11.1mmol/L) were regarded as having GDM [9]. FromDecember 1998 to December 2009, a total of 128,125 pregnantwomen took part in the GDM screening program and 6,247were diagnosed with GDM [12]. The average proportion ofscreened pregnancies was over 91% during 1999–2009 [9].
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