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Table 4 Outcomes of women with twin pregnancies by gestational weight gain

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

Maternal Outcome

All Participants

(N = 741)

Below IOM aGWG

(N = 201)

Within IOM aGWG

(N = 320)

Above IOM aGWG

(N = 220)

 
 

N (%) b

N (%) b

N (%) b

N (%) b

P value c

Gestational age at delivery, weeks, median (IQR)

37.0 (35.7, 38.0)

36.9 (35.6, 38.0)

37.1 (35.7, 38.0)

37.0 (35.7, 37.9)

0.49

PTB <37 weeks

 Overall

353 (47.6)

104 (51.7)

142 (44.4)

107 (48.6)

0.25

 Spontaneous

155 (20.9)

49 (24.4)

67 (20.9)

39 (17.7)

0.25

 Indicated

198 (26.7)

55 (27.4)

75 (23.4)

68 (30.9)

0.15

Labour induction

235 (31.7)

67 (33.3)

86 (26.9)

82 (37.3)

0.03

Mode of delivery

 Vaginal birth (unassisted)

304 (41.0)

98 (48.8)

125 (39.1)

81 (36.8)

0.03

 Forceps/ vacuum

50 (6.8)

12 (6.0)

25 (7.8)

13 (5.9)

0.60

 Caesarean section

387 (52.2)

91 (45.3)

170 (53.1)

126 (57.3)

0.04

Postpartum haemorrhage

148 (20.0)

42 (20.9)

63 (19.7)

43 (19.6)

0.93

Length of stay, days, median (IQR)

3.4 (2.7, 4.3)

3.2 (2.5, 4.1)

3.5 (2.8, 4.3)

3.6 (2.8, 4.6)

0.02

  1. Abbreviations: BMI, body mass index; GWG, gestational weight gain; IOM, Institute of Medicine; IQR, inter-quartile range; N, number; PTB, preterm birth
  2. a Gestational weight gain categories (below, within, and above IOM GWG) are based on the 2nd and 3rd trimester weekly rates of GWG
  3. b Outcomes are mostly reported as N (%), unless otherwise specified (i.e., median (IQR))
  4. c P values were calculated with the Kruskal-Wallis test for continuous variables and with the χ2 test or Fisher’s exact test for categorical variables