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Table 1 Main characteristics of the studies included

From: Gestational diabetes and pregnancy outcomes - a systematic review of the World Health Organization (WHO) and the International Association of Diabetes in Pregnancy Study Groups (IADPSG) diagnostic criteria

Study N Incidence of GDM (%)1 Ethnicity Maternal age 2 Gestational age at OGGT (weeks) 2   Pre-gravid BMI2 Study criteria for GDM treatment 3 mmol/L
Aberg 2001 [12] Sweden 4773 5.2 Not reported Not reported 25-30   Not reported 2 hs PG > 9.0
Black 2010 [13] USA 8711 19.4 White: 7.2; Black: 10.;1 Hispanic: 74.4; Asian: 7.4; Other: 0.9 29.1 ± 5.9 26.7 ± 2.9   27.5 ± 6.1 At least 2 abnormal values: FPG ≥ 5.5; 1 hPG ≥ 10.8; 2 hPG ≥ 8.9
EBDG 2001 [16] Brazil 4998 7.5 White: 44.9 Mixed: 41.1 Black: 13.6 Other: 0.4 27.8 ± 5.5 24-28   23.4 ± 4.0 2 hPG ≥ 10.0
Forsbach 1997 [14] Mexico 667 16.0 Hispanic 18 - 44 34.2 (24-40)   Not reported 2 hPG > 10.0
HAPO 2008, 2010 [7, 19] multi-countries 23316 11.4 White: 48.3 Black: 11.6 Hispanic: 8.5 Asian: 29.0 Other: 2.6 29.2 ± 5.8 27.8 ± 1.8 27.7 ± 5.1 FPG > 5.8; or 2 hPG > 10.0; or RPG ≥ 8.9  
Khan 1994 [15] Pakistan 1278 4.9 Not reported 26.7 ± 4.6 16 - 20 Not reported . At least 2 abnormal values: FPG > 5.8; 1 hPG > 10.3; 2 hPG > 7.8/3 hPG > 6.8  
Shirazian 2008 [17] Iran 670 12.1 Not reported NR 24-28 Not reported At least 2 abnormal values: FPG ≥ 5.5; 1 hPG ≥ 10.0; 2 hPG ≥ 8.3  
Sugaya 2000 [18] Japan 416 32.5 Asian 30.3 ± 4.3 25.4 ± 8.2 22.4 ± 3.8 At least 2 abnormal values: FPG ≥ 5.5; 1 hPG ≥ 10.0; 2 hPG ≥ 8.3  
  1. GDM: Gestational diabetes; OGTT: Oral glucose tolerance test; PG: Plasma glucose; FPG: Fasting PG; RPG: random PG
  2. 1 GDM incidence according to WHO except for Black et al., who used the IASDPG criteria
  3. 2 Range or mean ± SD
  4. 3 The meta-analyses only included untreated women, as defined in each study