Table 2 Overall and subgroup analyses of the association between maternal pre-pregnancy bodyweight and gestational diabetes mellitus

Overall analysis

1715

(25.99)

1264

(25.69)

158

(18.20)

0.64

(0.54–0.77)

0.68

(0.57–0.82)

238

(35.79)

1.61

(1.36–1.91)

1.54

(1.29–1.84)

55

(37.93)

1.77

(1.26–2.49)

1.74

(1.23–2.47)

maternal age^a

 < 35

1239 (23.74)

918 (23.54)

138 (18.16)

0.72

(0.59–0.88)

0.72

(0.59–0.88)

150 (32.97)

1.60

(1.30–1.97)

1.62

(1.31–2.00)

33 (31.13)

1.47

(0.97–2.23)

1.47

(0.96–2.25)

 >  = 35

476 (34.59)

346 (33.95)

20 (18.52)

0.44

(0.27–0.73)

0.43

(0.26–0.71)

88 (41.90)

1.40

(1.04–1.90)

1.40

(1.03–1.92)

22 (56.41)

2.52

(1.32–4.80)

2.70

(1.41–5.19)

Multiple gestations^b

Singleton

1259 (26.20)

942 (26.22)

96 (15.61)

0.52

(0.41–0.65)

0.56

(0.44–0.70)

176 (36.14)

1.59

(1.30–1.94)

1.55

(1.26–1.91)

45 (40.18)

1.89

(1.29–2.78)

1.89

(1.28–2.80)

Multiple gestations

456 (25.45)

322 (24.25)

62 (24.51)

1.01

(0.74–1.39)

1.05

(0.76–1.45)

62 (34.83)

1.67

(1.20–2.33)

1.54

(1.10–2.18)

10 (30.30)

1.36

(0.64–2.88)

1.28

(0.59–2.76)