Table 2.
Unadjusted odds ratio (OR) of pregnancy complications by pre-pregnancy body mass index (BMI)
| Pregnancy outcomes | In total N=1418 | ||||||
|---|---|---|---|---|---|---|---|
|
| |||||||
| underweight OR (95% CI) | P value | Normal OR (95% CI) | overweight OR (95% CI) | P value | obese OR (95% CI) | P value | |
| LBW | 2.958 (1.51~5.8) | 0.001 | 1.0 | 1.261 (0.72~2.22) | 0.423 | 1.151 (0.54~2.44) | 0.714 |
| Macrosomia | 0.597 (0.27~1.33) | 0.202 | 1.0 | 1.637 (1.14~2.36) | 0.007 | 2.915 (1.93~4.39) | < 0.00001 |
| Preterm labor | 0.908 (0.44~1.88) | 0.794 | 1.0 | 1.486 (1.00~2.20) | 0.047 | 1.786 (1.11~2.88) | 0.016 |
| gestational hypertension | 1.264 (0.36~4.39) | 0.7121 | 1.0 | 2.717 (1.41~5.21) | 0.002 | 5.917 (3.05~11.49) | < 0.00001 |
LBW: low birth weight; P < 0.05 indicates a significant difference by chi-squared test or Fisher’s exact test.