Table 2.
Association between pre-pregnancy weight, weight gain during pregnancy and preterm birth – unadjusted analysis
| |
Underweight |
Overweight |
Obese |
||||||
|---|---|---|---|---|---|---|---|---|---|
|
Spontaneous births |
Induced |
Spontaneous births |
Induced |
Spontaneous births |
Induced |
||||
| Weight gain (kg) | PTB with PROM | PTB without PROM | PTB | PTB with PROM | PTB without PROM | PTB | PTB with PROM | PTB without PROM | PTB |
|
< 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) | |
*p < 0.05.
**p < 0.001.
***p < 0.0001.