|  | GDM present | GDMnot present | GDM not verified | Total | 
      
        | N | 46 | 276 | 979 | 1,301 | 
      
        | Age (years) | 30.8 ± 4.6 | 30.6 ± 4.9 | 30.8 ± 5.0 | 30.8 ± 4.9 | 
      
        | BMI before pregnancy(kg/m2) | 25.6 ± 4.4 | 25.7 ± 5.2 | 23.8 ± 4.4 | 24.2± 4.6 | 
      
        | Ethnicity | 
      
        | Igbo | 37    (82.2) | 247    (90.5) | 848    (89.4) | 1,132    (89.4) | 
      
        | Non-Igbo | 8    (17.8) | 26    (9.5) | 101    (10.6) | 135    (10.6) | 
      
        | Family history of diabetes | 
      
        | Yes | 13    (28.9) | 55    (20.1) | 185    (19.5) | 253    (19.7) | 
      
        | No | 32    (71.1) | 218    (79.9) | 783    (80.5) | 1,033    (80.3) | 
      
        | Smoking | 
      
        | Yes | 8    (17.4) | 46    (17.0) | 170    (17.5) | 224    (17.4) | 
      
        | No | 38    (82.6) | 225    (83.0) | 799    (82.5) | 1,062    (82.6) | 
      
        | Hospital | 
      
        | EBSUTHAI | 22    (47.8) | 99    (35.9) | 874    (89.3) | 995    (76.5) | 
      
        | FMC | 24    (52.2) | 177    (64.1) | 105    (10.7) | 306    (23.5) | 
      
        | Obstetric history 1 | 
      
        | Previous spontaneous abortion | 15    (32.6) | 84    (30.4) | 317    (32.4) | 416    (32.0) | 
      
        | Non-previous spontaneous abortion | 31    (67.4) | 192    (69.6) | 662    (67.6) | 885    (68.0) | 
      
        | Obstetric history 2 | 
      
        | Nullipara | 19    (43.2) | 112    (40.9) | 422    (44.3) | 553    (43.5) | 
      
        | Multipara    with history of GDM | 2    (4.5) | 8    (2.9) | 6    (0.6) | 16    (1.3) | 
      
        | Multipara    without history of GDM | 23    (52.3) | 154    (56.2) | 525    (55.1) | 702    (55.2) | 
      
        | Obstetric    history 3 | 
      
        | Nullipara | 19    (43.2) | 112    (40.7) | 422    (44.3) | 553    (43.5) | 
      
        | Multipara    with perinatal mortality | 4    (9.1) | 17    (6.2) | 47    (4.9) | 68    (5.3) | 
      
        | Multipara    without perinatal mortality | 21    (47.7) | 146    (53.1) | 484    (50.8) | 651    (51.2) |