| Gestation weeks | ACS given | No ACS | P Value |
| N (%) | N (%) | ||
| 27 | 5 (27.8) | 17 (94.4) | <0.001 |
| 28 | 7 (35.0) | 33 (28.4) | 0.553 |
| 29 | 2 (13.3) | 18 (51.4) | 0.012 |
| 30 | 5 (21.7) | 14 (31.1) | 0.415 |
| 31 | 8 (29.6) | 10 (35.7) | 0.631 |
| 32 | 5 (11.4) | 20 (21.1) | 0.167 |
| 33 | 7 (10.9) | 8 (19.5) | 0.221 |
| 34 | 3 (3.0) | 27 (18.2) | <0.001 |