Table 4.
Risk factors for cesarean delivery for twins in the United States 1995 to 2008.
| Years included |
1995–2006 | 1995 | 2006 | |||
|---|---|---|---|---|---|---|
| Risk ratio | 95% CI | Risk ratio | 95% CI | Risk ratio | 95% CI | |
| Preterm birth (< 37 weeks) | 0.99 | (0.99, 0.99) | 1.01 | (1.00, 1.03) | 0.98 | (0.97, 0.99) |
| Small for gestational age | 1.00 | (0.99, 1.00) | 0.98 | (0.97, 1.00) | 1.00 | (0.99, 1.01) |
| Hypertension | 1.26 | (1.25, 1.26) | 1.31 | (1.29, 1.33) | 1.17 | (1.16, 1.18) |
| Diabetes | 1.08 | (1.07, 1.09) | 1.07 | (1.03, 1.11) | 1.08 | (1.07, 1.10) |
| Cephalopelvic disproportion | 1.58 | (1.58, 1.58) | 1.84 | (1.82, 1.85) | 1.36 | (1.34, 1.36) |
| Fetal distress | 1.36 | (1.36, 1.37) | 1.51 | (1.48, 1.53) | 1.20 | (1.18, 1.21) |
| Breech | 1.62 | (1.62, 1.62) | 1.85 | (1.83, 1.86) | 1.40 | (1.39, 1.40) |
| Previous cesarean | 1.65 | (1.65, 1.65) | 1.86 | (1.85, 1.87) | 1.41 | (1.40, 1.41) |
| Induction | 0.43 | (0.41, 0.43) | 0.45 | (0.44, 0.48) | 0.44 | (0.42, 0.44) |
| One year advance | 1.05 | (1.04, 1.05) |