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 | Â | Â | Â | Â | Â | Â | Â | Â | Â |
< 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) | Â | |
Black | Â | Â | Â | Â | Â | Â | Â | Â | Â |
< 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) |