Characteristics of the preterm infants with RDS
| Frequency (n=167) | Per cent | Mean (SD) | ||
| Sex | Men | 88 | 52.7 | |
| Women | 79 | 47.3 | ||
| Birth weight | Median (IQR) 1300.0 (1050.0–1700.0) | 1391.4 (468.4) | ||
| ELBW (≤1000) | 33 | 19.8 | 850.9 (112.6) | |
| VLBW (1001–1500) | 82 | 49.1 | 1233.0 (140.0) | |
| LBW (1501–2500) | 51 | 30.5 | 1970.2 (280.5) | |
| >2500 | 1 | 0.6 | 2510 (-) | |
| Gestation age | Median (IQR) 30.0 (28.0–34.0) | |||
| <28 weeks | 24 | 14.4 | 26.2 (0.7) | |
| 28 to<32 weeks | 63 | 37.7 | 29.1 (0.9) | |
| 32 to<34 weeks | 32 | 19.2 | 32.9 (0.3) | |
| 34 to<37 weeks | 48 | 28.7 | 34.8 (0.8) | |
| Mode of delivery | SVD | 86 | 51.5 | |
| CS | 81 | 48.5 | ||
| Gestation | Single | 146 | 87.4 | |
| Twin | 17 | 10.2 | ||
| Triplet | 4 | 2.4 |