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Table 3 Association between pre-pregnancy weight, weight gain during pregnancy and preterm birth – stratified by race

From: Pre-pregnancy BMI and weight gain: where is the tipping point for preterm birth?

 

Underweight

Overweight

Obese

Weight gain (kg)

Spontaneous births

Induced

Spontaneous births

Induced

Spontaneous births

Induced

PTB with PROM

PTB without PROM

PTB

PTB with PROM

PTB without PROM

PTB

PTB with PROM

PTB without PROM

PTB

White

         

< 7.0

1.96**

2.13*

0.57

0.64*

0.34**

0.65

0.44**

0.36*

0.60

(1.34, 2.86)

(1.33, 3.41)

(0.21, 1.58)

(0.46, 0.90)

(0.19, 0.60)

(0.38, 1.10)

(0.27, 0.71)

(0.18, 0.72)

(0.31, 1.16)

7.0-9.4

1.28

1.93*

1.18

0.90

1.39

0.73

0.57

0.38

1.47

(0.80, 2.02)

(1.13, 3.31)

(0.56, 2.50)

(0.55, 1.47)

(0.79, 2.45)

(0.31, 1.70)

(0.18, 1.83)

(0.05, 2.72)

(0.45, 4.76)

9.5-12.7

2.04**

2.41***

1.45

1.00

0.38

0.89

1.04

0.79

2.22

(1.39, 2.98)

(1.56, 3.73)

(0.70, 2.98)

(0.59, 1.69)

(0.14, 1.04)

(0.35, 2.24)

(0.38, 2.86)

(0.19, 3.26)

(0.68, 7.23)

> 12.7

1.36

1.51

1.60

1.23

0.81

0.76

1.83

1.62

-

(0.27, 2.16)

(0.87, 2.64)

(0.76, 3.35)

(0.71, 2.12)

(0.39, 1.71)

(0.27, 2.16)

(0.79, 4.27)

(0.58, 4.51)

 

Black

         

< 7.0

1.51*

1.70**

0.84

0.62***

0.54***

0.76

0.59***

0.50***

1.17

(1.17, 1.95)

(1.27, 2.28)

(0.30, 2.34)

(0.51, 0.74)

(0.43, 0.68)

(0.44, 1.32)

(0.44, 0.70)

(0.37, 0.67)

(0.66, 2.06)

7.0-9.4

1.03

1.02

1.24

0.76

0.41***

1.30

0.68

0.30*

0.36

(0.74, 1.42)

(0.71, 1.49)

(0.48, 3.21)

(0.56, 1.01)

(0.27, 0.63)

(0.61, 2.77)

(0.43, 1.07)

(0.14, 0.65)

(0.05, 2.68)

9.5-12.7

1.18

1.26

1.09

0.82

0.96

1.31

0.82

0.41*

3.25

(0.90, 1.56)

(0.90, 1.75)

(0.42, 2.81)

(0.62, 1.09)

(0.70, 1.33)

(0.60, 2.86)

(0.51, 1.33)

(0.18, 0.93)

(1.33, 7.90)

> 12.7

0.66*

1.10

0.65

0.97

0.90

1.14

0.97

1.31

1.50

(0.46, 0.97)

(0.74, 1.62)

(0.20, 2.15)

(0.76, 1.26)

(0.65, 1.26)

(0.54, 2.40)

(0.67, 1.40)

(0.86, 1.99)

(0.58, 3.87)

  1. ***p < 0.0001.
  2. **p < 0.001.
  3. *p < 0.05.