Table 2 Association between pre-pregnancy weight, weight gain during pregnancy and preterm birth – unadjusted analysis

< 7.0

1.66***

1.75***

0.72

0.70***

0.57***

0.68*

0.58***

0.54***

0.87

(1.36, 2.03)

(1.38, 2.21)

(0.37, 1.42)

(0.58, 0.79)

(0.46, 0.69)

(0.47, 0.98)

(0.47, 0.70)

(0.42, 0.69)

(0.58, 1.30)

7.0-9.4

1.22

1.23

1.13

0.86

0.68*

0.90

0.88

0.38*

0.74

(0.96, 1.57)

(0.92, 1.65)

(0.63, 2.03)

(0.67, 1.09)

(0.50, 0.94)

(0.52, 1.57)

(0.59, 1.32)

(0.19, 0.76)

(0.27, 2.03)

9.5-12.7

1.39*

1.52**

1.17

1.00

0.97

1.14

0.99

0.57

2.82*

(1.12, 1.73)

(1.19, 1.95)

(0.60, 2.06)

(0.79, 1.26)

(0.73, 1.29)

(0.66, 1.99)

(0.64, 1.52)

(0.29, 1.11)

(1.45, 5.49)

>12.7

0.82

1.11

1.11

1.19

1.00

1.05

1.35

1.65*

1.29

(0.62, 1.09)

(0.82, 1.51)

(0.60, 2.07)

(0.96, 1.49)

(0.75, 1.34)

(0.59, 1.87)

(0.97, 1.88)

(1.13, 2.41)

(0.56, 3.00)