| Finding | USA (n = 50) | Poland (n = 105) | Statistics |
| CNEC | 31(62%) | 69(66%) | p = . 0.65 |
| TNEC | 19(38%) | 36(34%) | p = 0.65 |
| Antenatal steroid | None (36%) Betamethasone (64%) | None (29%) Betamethasone (41%) Dexamethasone (30%) | |
|
Mean days of
ROM before delivery | 20 | 4 | p < 0.01 |
| Chorioamnionitis | 15(30%) | 47(44%) | p = 0.08 |
| Mean postnatal day of NEC onset | 19 | 12 | p < 0.01 |
| Colitis (Hematochezia) | 17(34%) | 18(17%) | p < 0.02, OR=1.8, 95% CI [1.1,2.7] |
| Survival after NEC | 38(76%) | 95(90%) | p = 0.02, OR=1.6, 95% CI [1,2.5] |