| Deaths, % (n = 35) | Survivors, % (n = 371) | RR (95% CI) | |
| Pre-existing disease | 100 | 41 | 2.36 (2.02 to 2.76) |
| 2 or more pre-existing diseases | 54 | 12 | 4.38 (2.92 to 6.58) |
| Cardiac anomaly | 68 | 23 | 2.98 (2.16 to 4.12) |
| HPBF cardiac | 65 | 64 | 1.01 (0.71 to 1.44) |
| Nosocomial infection | 18 | 6 | 2.89 (1.26 to 6.6) |
| Ex-pretermer | 9 | 19 | 0.46 (0.15 to 1.39) |
| Under 6 weeks old | 17 | 35 | 0.48 (0.23 to 1.02) |
| Under 1 year of age | 71 | 78 | 0.91 (0.72 to 1.13) |
| Gender (male) | 56 | 55 | 1.02 (0.75 to 1.4) |
| Bacterial co-infection | 24 | 36 | 0.66 (0.35 to 1.24) |
| Inter-hospital transfer | 32 | 52 | 0.61 (0.37 to 1.01) |
Pre-existing disease = chromosomal abnormalities, cardiac lesions, neuromuscular disorders, chronic lung disease, large airway abnormality and immunodeficiency.
HPBF cardiac, cardiac lesions with high pulmonary blood flow (eg, septal and atrioventricular canal defects); RR, relative risk (death vs survival).