Table 3. Perinatal outcomes across maternal pre-pregnancy BMI categories§.
| Normal weight | Overweight‡ | Obese‡ | |||||
|---|---|---|---|---|---|---|---|
| n (%) | n (%) | Crude OR (95%CI) | Adjusted OR (95%CI) | n (%) | Crude OR (95%CI) | Adjusted OR (95%CI) | |
| Fetal macrosomia1 | 107 (8.1) | 60 (12.7) | 1.6 (1.1–2.3) | 1.4 (1.1–2.1) | 31 (14.7) | 1.9 (1.2–2.9) | 2.0 (1.3–3.2) |
| Apgar score <7 at 5 min2 | 23 (1.8) | 4 (0.8) | 2.0 (0.7–6.0) | 2.0 (0.6–6.2) | 2 (0.9) | 1.8 (0.4–7.9) | 1.9 (0.4–8.9) |
| NICU admission3 | 74 (5.6) | 28 (5.9) | 1.1 (0.6–1.6) | 1.1 (0.7–1.8) | 16 (7.6) | 1.3 (0.7–2.4) | 1.4 (0.7–2.6) |
| LOS4 | |||||||
| LOS ≤ 24 hs | 351 (52.4) | 135 (62.5) | 1.5 (1.1–2.1) | 1.4 (1.1–2.1) | 48 (55.8) | 1.1 (0.7–1.8) | 1.0 (0.6–1.6) |
| LOS ≤ 48 hs | 642 (95.8) | 210 (97.2) | 1.5 (0.6–3.7) | 1.1 (0.4–2.8) | 85 (98.8) | 3.7 (0.5–27.6) | 5.5 (0.4–61.7) |
Abbreviations: BMI, body mass index; LOS, length of hospital stay; NICU, neonatal intensive care unit; OR, odds ratio; CI, confidence intervals.
1Fetal macrosomia defined as birth weight ≥4000 g; adjusted for maternal age, ethnicity, history of LGA, gestational age at delivery;
2Apgar score at 5 min less than 7; adjusted for pregnancy complications, type of labour onset and mode of delivery, presence of meconium in the amniotic fluid;
3Neonatal intensive care admission; adjusted for maternal age, parity, mode of delivery, Apgar score at 5 min, resuscitation at birth, congenital anomalies;
4Postnatal length of hospital stay; adjusted for maternal age, parity, mode of delivery, Apgar score at 5 min, and admission to NICU;
‡Reference category normal weight, BMI = 18.50–24.99 kg/m2 pre-pregnancy; §Overweight = BMI 25.00–29.99 kg/m2, Obese = BMI > 30.00 kg/m2.