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Table 6 The 2nd-3rd trimester weekly GWG in women with twin pregnancies with optimal and suboptimal outcomes

From: Examining the provisional guidelines for weight gain in twin pregnancies: a retrospective cohort study

 

Normal weight

BMI 18.5–24.9 kg/m2

Overweight

BMI 25.0–29.9 kg/m2

Obese

BMI ≥ 30 kg/m2

 

25th – 75th percentiles of 2nd + 3rd trimester weekly GWG (kg/week)a

IOM provisional guideline

0.53–0.84

0.48–0.82

0.38–0.68

IOM definition in NSAPD

 Optimal outcome b

0.58–0.87

0.49–0.85

0.30–0.77

 Sub-optimal outcome

0.45–0.85

0.52–0.87

0.34–0.72

New definition in NSAPD

 Optimal outcome c

0.61–0.86

0.48–0.88

0.29–0.80

 Sub-optimal outcome

0.45–0.85

0.52–0.86

0.33–0.72

  1. Abbreviations: BMI, body mass index; GWG, gestational weight gain; IOM, Institute of Medicine; NSAPD, Nova Scotia Atlee Perinatal Database
  2. a 2nd and 3rd trimester weekly GWG were calculated according to the formula: (Total GWG – IOM Average Cumulative GWG up to 13 weeks) / (Gestational Age – 13). The IOM Average Cumulative GWGs up to 13 weeks were 3.6 kg, 2.1 kg and 2.0 kg in normal weight, overweight and obese women
  3. b Optimal outcome defined as birth at 37–42 weeks and average twin birth weight ≥ 2500 g
  4. c Optimal outcome defined as birth at 37–38 6/7 weeks and birth weight of both twins individually ≥2500 g