Respiratory distress syndrome (RDS) according to obstetric and neonatal characteristics
| N | RDS | p Value | ||
|---|---|---|---|---|
| n | % | |||
| *Comparison between five exclusive groups of causes defined in the following order: hypertension, either pre-existing or due to pregnancy; maternal bleeding (abruptio placenta, placenta previa, and other uterine bleeding) without hypertension; preterm premature rupture of membranes (PPROM) without hypertension or bleeding; preterm spontaneous labour without hypertension, bleeding, or PPROM; all other causes, excluding hypertension, bleeding, PPROM of preterm spontaneous bleeding. | ||||
| IUGR, Intrauterine growth retardation defined as a birth weight ratio <0.74.31 | ||||
| Gestational age (weeks) | ||||
| 27–28 | 164 | 113 | 68.9 | 0.001 |
| 29–30 | 213 | 98 | 46.0 | |
| 31–32 | 481 | 144 | 29.9 | |
| Total | 858 | |||
| IUGR | ||||
| Yes | 211 | 89 | 42.2 | 0.74 |
| No | 643 | 263 | 40.9 | |
| Total | 854 | |||
| Main cause of preterm birth* | ||||
| Hypertension | 235 | 126 | 53.6 | 0.001 |
| Uterine bleeding | 230 | 95 | 41.3 | |
| PPROM | 172 | 38 | 22.1 | |
| Preterm spontaneous labour | 152 | 71 | 46.7 | |
| Other | 69 | 25 | 36.2 | |
| Total | 858 | |||
| Sex | ||||
| Boys | 458 | 189 | 41.3 | 0.92 |
| Girls | 399 | 166 | 41.6 | |
| Total | 857 | |||
| Mode of delivery | ||||
| Vaginal | 309 | 102 | 33.0 | 0.001 |
| Caesarean section | 548 | 253 | 46.2 | |
| Total | 857 | |||