Table 1.
Demographic characteristics of pregnancies according to gestational age at delivery.
| Characteristics | Extreme PTB (n = 125) (%) | Very PTB (n = 784) (%) | Moderate to Late PTB (n = 13,323) (%) | Term Births (n = 206,362) (%) | p-Value | |
|---|---|---|---|---|---|---|
| Maternal Age | 28.47 | 28.36 | 28.31 | 28.24 | 0.482 | |
| Parity | 1 | 38.1 | 31.4 | 29.0 | 24.2 | <0.001 |
| 2–4 | 48.3 | 47.7 | 47.7 | 52.0 | ||
| 5+ | 13.6 | 20.9 | 23.3 | 23.8 | ||
| Mode of delivery | Vaginal | 48.3 | 46.5 | 67.3 | 83.9 | <0.001 |
| Assisted | 0.0 | 0.6 | 1.7 | 3.3 | ||
| Cesarean | 51.7 | 52.8 | 31.0 | 12.7 | ||
| Birthweight (grams) | 1096.13 ± 601.4 | 1644.43 ± 633.4 | 2540.32 ± 495.3 | 3270.5 ± 455.6 | <0.001 | |
| Maternal diabetes | 0.0 | 6.2 | 8.1 | 5.2 | <0.001 | |
| Hypertensive disorders | 8.5 | 19.1 | 12.9 | 4.7 | <0.001 | |
PTB, preterm birth.