Comparison of the incidence of short-term complications in survivors before (period 1) and after (period 2) the publication of the Swiss recommendations
| Period 1n = 220 | Period 2n = 204 | OR (95% CI) | |
| Survival n (%) | 67 (31%) | 81 (40%) | 1.54 (1.03, 2.23) |
| PIVH III/IV | 1.5% | 3.7% | 2.50 (0.25, 24.68) |
| Unknown n (%) | 3 (4.5%) | 11 (13.4%) | |
| Cystic PVL | 1.5% | 4.9% | 3.39 (0.37, 31.05) |
| Unknown n (%) | 3 (4.5%) | 11 (13.4%) | |
| ROP III-V | 7.5% | 11% | 1.53 (0.49, 4.80) |
| Unknown n (%) | 17 (25.4%) | 20 (24.4%) | |
| Moderate/severe BPD | 23.9% | 32.9% | 1.51 (0.73, 3.12) |
| Unknown n (%) | 2 (3%) | 10 (12.2%) |
BPD, bronchopulmonary dysplasia; CI, confidence interval; PIVH, periventricular/intraventricular haemorrhage; PVL, periventricular leukomalacia; ROP, retinopathy of prematurity.