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Table 1 Clinical characteristics in the second pregnancy associated with GDM status

From: Weight retention at six weeks postpartum and the risk of gestational diabetes mellitus in a second pregnancy

  GDM in the second pregnancy P
Yes (n = 1098) No (n = 5331)
Maternal age (y) second pregnancy 32.7 ± 4.7 32.7 ± 4.1 0.533
Interpregnancy interval (week) 47.5 ± 26.1 43.3 ± 27.1 < 0.001
BMI (kg/m2) in the first pregnancy 22.9 ± 3.3 22.5 ± 4.2 0.008
Interpregnancy BMI change    < 0.001
 Lost 1.0 or more 31 503  
 Remain stable (±1.0) 476 2852  
 Gained 1.1–2.0 237 812  
 Gained 2.1–3.0 159 542  
 Gained more than 3.0 195 622  
Gestational weight gain during the second pregnancy    < 0.001
 Inadequate 485 1745  
 Adequate 365 2165  
 Excessive 248 1421  
The weight retention at six weeks postpartum after the first pregnancy    < 0.001
 Lost 1.0 or more 3 15  
 Remain stable (±1.0) 27 218  
 Gained 1.0–1.9 181 1060  
 Gained 2.0–2.9 260 2227  
 Gained 3.0 or more 627 1811  
  1. BMI, Body mass index; GDM, Gestational diabetes mellitus; OR, Odds ratio