Gestational age (weeks) | at admission | at delivery | P value |
28 - 30 | 39 (34.5) | 14 (12.4) | 0.0002 |
31 - 33 | 66 (58.4) | 64 (56.6) | 0.8893 |
≥34 | 8 (7.1) | 35 (31.0) | <0.0001 |