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Causes of SVI/BL by age groups using aetiological classification
| ≤15 years | >15 years | |||
| Aetiological category | No | % | No | % |
| Hereditary disease | 9 | 19.6 | 12 | 12.7 |
| Intrauterine factor | 2 | 4.3 | 9 | 9.6 |
| Childhood factor | 17 | 37 | 37 | 39.4 |
| Unknown | 18 | 39.1 | 36 | 38.3 |
| Total | 46 | 100 | 94 | 100 |
