Table 2. Clinical characteristics of the preterm infants recruited in this study.
| Infant | Hospital stay (days) | Antibiotherapy (days) | Mechanical ventilation (days) | Parenteral nutrition (days) | Nasogastric feeding tube (days) |
| 1 | 26 | 3 | 0 | 3 | 18 |
| 2 | 42 | 3 | 0 | 5 | 38 |
| 3 | 60 | 4 | 0.5 | 3 | 48 |
| 4 | 27 | 3 | 2 | 0 | 26 |
| 5 | 27 | 0 | 0 | 0 | 26 |
| 6 | 113 | 5 | 9 | 8 | 107 |
| 7 | 68 | 4 | 2 | 5 | 58 |
| 8 | 84 | 7 | 0.5 | 6 | 70 |
| 9 | 28 | 3 | 0 | 0 | 21 |
| 10 | 102 | 15 | 26 | 8 | 97 |
| 11 | 47 | 2 | 0 | 5 | 45 |
| 12 | 37 | 3 | 0 | 4 | 35 |
| 13 | 92 | 8 | 1 | 14 | 83 |
| 14 | 68 | 7 | 0 | 7 | 62 |
| Mean (95% CI) | 58.64 (41.35; 75.93) | 3.5 (3.0–7.0)* | 0.25 (0.00–1.75)* | 4.85 (2.66; 7.05) | 52.40 (36.03; 68.82) |
*
Median (IQR).