Table 5. Frequency rate and adjusted risk of maternal morbidity, SGA-birth and spontaneous preterm delivery during second pregnancy in relation to change in BMI between first and second pregnancy, and BMI category at second pregnancy booking.
| Model 1- second pregnancy outcome | ||||
| Maternal Morbidity | SGA-birth | Spontaneous Preterm <37weeks | ||
| Number of affected pregnancies | Rate (%) | 1139 (22.4%) | 467 (9.2%) | 324 (6.4%) |
| Categorical predictors | ||||
| BMI gain vs. stable, Pregnancy 1–2 | OR(95% CI) | 1.32 (1.09–1.60)** | 0.81 (0.60–1.11) | 0.98 (0.65–1.48) |
| BMI loss vs. stable, Pregnancy 1–2 | OR(95% CI) | 1.14 (0.84–1.57) | 1.88 (1.24–2.85)** | 1.41 (0.78–2.57) |
| At Pregnancy 2 | ||||
| Obese vs. normal | OR(95% CI) | 1.38 (0.96–1.99) | 1.18 (0.67–2.10) | 0.82 (0.31–1.60) |
| Overweight vs. normal | OR(95% CI) | 1.19 (0.97–1.45) | 0.80 (0.58–1.09) | 0.75 (0.48–1.15) |
| Undernourished vs. normal | OR(95% CI) | 1.51 (0.76–2.99) | 1.16 (0.57–2.36) | 1.63 (0.70–3.82) |
| Model 2 –second pregnancy outcome | ||||
| Maternal Morbidity | SGA-birth | Spontaneous Preterm <37weeks | ||
| Number of affected pregnancies | Rate (%) | 1139 (22.4%) | 467 (9.2%) | 324 (6.4%) |
| Categorical predictors | ||||
| BMI gain vs. stable, Pregnancy 1–2 | OR(95% CI) | 1.29 (1.06–1.56)** | 0.86 (0.62–1.19) | 0.96 (0.64–1.46) |
| BMI loss vs. stable, Pregnancy 1–2 | OR(95% CI) | 1.16 (0.84–1.59) | 2.07 (1.32–3.22)*** | 1.41 (0.77–2.56) |
| At Pregnancy 2 | ||||
| Obese vs. normal | OR(95% CI) | 1.34 (0.93–1.94) | 1.26 (0.68–2.34) | 0.67 (0.30–1.50) |
| Overweight vs. normal | OR(95% CI) | 1.16 (0.94–1.41) | 0.86 (0.61–1.20) | 0.72 (0.47–1.12) |
| Undernourished vs. normal | OR(95% CI) | 1.63 (0.82–3.22) | 0.94 (0.43–2.04) | 1.72 (0.73–4.03) |
Maternal morbidity if an individual had one or more complications including pre-eclampsia, gestational hypertension, caesarean delivery or thromboembolism during second pregnancy. Odds ratios and 95% confidence limits from logistic regression
*P<0.05
**P<0.01
***P<0.001. Model 1 adjusted for baseline BMI at first pregnancy, height, inter-delivery interval between first and second pregnancy, and maternal age, year of delivery, smoking habit, gestational age and baby gender at second pregnancy. Model 2 additionally adjusted for placental weight at second delivery.