Univariable analysis: association of preoperative risk factors with in-hospital mortality
| Risk factors | In-hospital mortality | P value | |
| No (529) | Yes (39) | ||
| n (%) | n (%) | ||
| Gender | |||
| Male | 199 (37.6) | 14 (35.9) | 0.83 |
| Female | 330 (62.4) | 25 (64.1) | |
| Age (days) mean±SD | 13.2±7.6 | 10.3±5.6 | 0.004 |
| Weight group | |||
| Normal birth weight | 420 (79.4) | 25 (64.1) | 0.025 |
| Low birth weight | 109 (20.6) | 14 (35.9) | |
| Birth weight (kg) | 2.81±0.49 | 2.59±0.47 | 0.021 |
| Type of surgery | |||
| Corrective | 461 (87.1) | 21 (53.8) | <0.001 |
| Palliative | 68 (12.9) | 18 (46.2) | |
| Non-cardiac abnormality | 15 (2.8) | 6 (15.4) | <0.001 |
| Chromosomal abnormality | 9 (1.7) | 1 (2.6) | 0.512 |
| Other medical illness | 21 (3.9) | 1 (2.6) | 1 |
| Surgical site infection | 43 (8.1) | 2 (5.1) | 0.759 |
| Postoperative sepsis | 114 (21.6) | 21 (53.8) | <0.001 |
| RACHS-I category | |||
| 1–3 | 311 (58.8) | 23 (59) | 0.996 |
| 4–6 | 216 (41.2) | 16 (41) | |
| Admission epoch | |||
| 2011–2014 | 267 (50.5) | 27 (69.2) | 0.024 |
| 2015–2018 | 262 (49.5) | 12 (30.8) | |