Table 3.
Association between pre-pregnancy weight, weight gain during pregnancy and preterm birth – stratified by race
| |
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) | |
***p < 0.0001.
**p < 0.001.
*p < 0.05.