Table 3A.
Comparison of pregnancy outcomes of obese pregnant women according to the IOM classification
| Underweight | Normal weight | Overweight | Obesity | |
|---|---|---|---|---|
| Prepregnancy BMI (kg/m) | <18.5 | 18.5 to 24.9 | 25 to 29.9 | ≥30 |
| n = 1,159 (19.1%) | n = 4,239 (69.9%) | n = 474 (7.8%) | n = 194 (3.1%) | |
| HDP | ||||
| % (n) | 2.5% (n = 29) | 4.0% (n = 169) | 8.4% (n = 40) | 21.1% (n = 41) |
| Adjusted OR (95% CI) | 0.57** (0.37-0.86) | 1 | 1.23** (1.58-3.44) | 5.85** (3.80-9.00) |
| GDM | ||||
| % (n) | 1.9% (n = 22) | 2.6% (n = 111) | 8.5% (n = 40) | 18% (n = 35) |
| Adjusted OR (95% CI) | 0.76 (0.48-1.22) | 1 | 2.48** (1.67-3.71) | 5.00** (3.09-8.11) |
| LGA | ||||
| % (n) | 4.4% (n = 51) | 9.5% (n = 402) | 19.7% (n = 93) | 23.7% (n = 46) |
| Adjusted OR (95% CI) | 0.43** (0.32-0.58) | 1 | 2.61** (2.01-3.38) | 3.50** (2.40-5.09) |
| SGA | ||||
| % (n) | 13.5% (n = 156) | 9.0% (n = 381) | 5.5% (n = 26) | 2.6% (n = 5) |
| Adjusted OR (95% CI) | 1.71** (1.39-2.10) | 1 | 1.18 (0.87-1.61) | 0.11** (0.04-0.28) |
| Macrosomia | ||||
| % (n) | 0.2% (n = 2) | 0.7% (n = 30) | 1.9% (n = 9) | 4.1% (n = 8) |
| Adjusted OR (95% CI) | 0.23* (0.05-0.96) | 1 | 2.86** (1.33-6.15) | 6.95** (3.11-15.53) |
| Spontaneous preterm birth | ||||
| % (n) | 5.8% (n = 64) | 2.5% (n = 100) | 4.1% (n = 18) | 2.6% (n = 5) |
| Adjusted OR (95% CI) | 2.33** (1.68-3.23) | 1 | 0.96 (0.54-1.70) | 0.31 (0.10-0.96) |
| Post-term birth | ||||
| % (n) | 5.6% (n = 65) | 8.0% (n = 339) | 7.6% (n = 36) | 6.2% (n = 12) |
| Adjusted OR (95% CI) | 0.62** (0.47-0.82) | 1 | 0.94 (0.66-1.34) | 0.44 (0.49-1.56) |
| PPH (CS) | ||||
| % (n) | 1.7% (n = 4) | 2% (n = 21) | 0% (n = 0) | 12.4% (n = 5) |
| Adjusted OR (95% CI) | 0.85 (0.29-2.50) | 1 | - | 3.65* (1.24-10.79) |
| PPH (VD) | ||||
| % (n) | 12.1% (n = 112) | 15.8% (n = 503) | 18.9% (n = 61) | 25.9% (n = 24) |
| Adjusted OR (95% CI) | 0.80 (0.64-1.00) | 1 | 1.35 (0.99-1.84) | 1.76* (1.07-2.87) |
| Neonatal acidosis | ||||
| % (n) | 7.1% (n = 81) | 5.5% (n = 227) | 5.9% (n = 27) | 3.6% (n = 7) |
| Adjusted OR (95% CI) | 1.31* (1.01-1.72) | 1 | 0.98 (0.63-1.50) | 0.57 (0.27-1.24) |
| Neonatal asphyxia | ||||
| % (n) | 2.8% (n = 32) | 2.2% (n = 93) | 3.0% (n = 14) | 3.1% (n = 6) |
| Adjusted OR (95% CI) | 1.32 (0.88-2.00) | 1 | 1.35 (0.76-2.38) | 1.06 (0.47-2.39) |
| Total CS | ||||
| % (n) | 20% (n = 229) | 24.6% (n = 1042) | 30.2% (n = 143) | 45.3% (n = 88) |
| Adjusted OR (95% CI) | 0.76** (0.64-0.91) | 1 | 1.23 (0.97-1.56) | 2.17** (1.52-3.08) |
*p <0.05 vs Normal weight; **p <0.01 vs Normal weight.