Table 6.
Comparison of demographic characteristics between two groups in the external validation set
| Data | NNO group (n=41) | ANO group (n=30) | t/χ2 | P |
|---|---|---|---|---|
| Gestational age (weeks) | 34.69 ± 1.19 | 34.22 ± 1.34 | 1.244 | 0.220 |
| Birthweight (g) | 2221.96 ± 117.63 | 2233.76 ± 115.26 | 0.338 | 0.737 |
| Boys [n (%)] | 14 (56%) | 13 (65%) | 0.375 | 0.540 |
| IVF [n (%)] | 5 (20%) | 5 (25%) | 0.002 | 0.968 |
| Bayley Mental Index | 92.04 ± 2.64 | 71.39 ± 5.39 | 15.684 | <0.001 |
| Maternal age (years) | 31.04 ± 4.41 | 30.54 ± 4.96 | 0.355 | 0.724 |
| Maternal education (years) | 11.63 ± 2.67 | 11.85 ± 2.37 | 0.285 | 0.777 |
| Primipara [n (%)] | 19 (76%) | 18 (90%) | 0.686 | 0.408 |
| Prenatal Steroid Use [n (%)] | 15 (60%) | 11 (55%) | 0.114 | 0.736 |
| Cesarean Delivery [n (%)] | 9 (36%) | 6 (30%) | 0.180 | 0.671 |
| Premature Rupture of Membranes [n (%)] | 10 (40%) | 7 (35%) | 0.118 | 0.731 |
| Apgar score 1 min | 7.31 ± 2.11 | 7.27 ± 2.11 | 0.053 | 0.958 |
| Apgar score 5 min | 8.61 ± 1.39 | 8.56 ± 1.53 | 0.113 | 0.911 |
| Hemorrhagic lesions [n (%)] | 2 (8%)/23 (92%) | 8 (40%)/12 (60%) | 4.862 | 0.027 |
| Ischemic lesions [n (%)] | 4 (16%)/21 (84%) | 9 (45%)/11 (55%) | 4.549 | 0.033 |
| BPD [n (%)] | 12 (48%)/13 (52%) | 16 (80%)/4 (20%) | 4.840 | 0.028 |
| Duration of Mechanical Ventilation (days) | 13.65 ± 4.38 | 17.35 ± 6.22 | 2.339 | 0.024 |
| Duration of Oxygen Therapy (days) | 46.07 ± 14.03 | 57.61 ± 16.15 | 2.562 | 0.014 |
NNO: Normal Neurodevelopmental Outcome; ANO: Adverse Neurodevelopmental Outcome; IVF: In vitro fertilization; BPD: Bronchopulmonary Dysplasia.