Among our cohort of 215 children, 57% were male. The median age of the patients was 31 months (range: < 1 to 208 months), with 19% of the children having less than 3 months of age ( Figure 2 ). As shown in Table 1 , 101/215 (47%) children presented with one or more underlying co-morbid condition, principally chronic lung diseases and neurological disorders. The median age of patients presenting co-morbidities was significantly higher than of those without (50 versus 14 months, p < 0.0001).