The most common underlying conditions in children admitted to hospital, Texas 1998–99.68
| Asthma (42%) |
| Congenital anomalies mostly cardiac (28.5%) |
| Chronic lung disease of prematurity |
| Immunodeficiencies |
| Malignancies |
| Renal disease |
| Haemaglobinopathies |
| Diabetes (and other metabolic conditions) |