Table 1.
Descriptive profile of the cohort children aged <5 years born in NSW between 2001 and 2010
| Characteristics | Frequency |
|---|---|
| Total number of children followed | 870 314 |
| Total person time (years) | 3 261 790 (3·8 years/child) |
| Male sex of the child (%) | 447 942 (51) |
| Median birthweight, g (IQR) | 3410 (IQR 3070–3745) |
| Median GA, weeks (IQR) | 39 (38–40) |
| Indigenous children (%) | 28 486 (3) |
| High-risk children | 3939 (14) |
| Healthy children | 24 547 (86) |
| Children with BPD (%) | 823 (0·1) |
| Preterm children (%) | |
| GA 32–36 weeks | 45 213 (5) |
| GA 28–31 weeks | 3779 (0·4) |
| GA<28 weeks | 1380 (0·2) |
| Children born at term with low birthweight (%) | 15 224 (2) |
| All-cause associated acute lower respiratory hospitalizations | |
| Total number of new episodes | 68 913 |
| Median age at hospitalization, months (IQR) | 9 (4–17) |
| Median length of hospitalization, days (IQR) | 2 (1–3) |
| RSV-coded hospitalizations | |
| Total number of new episodes | 16 119 (23% of all respiratory hospitalization) |
| Median age at hospitalization, months (IQR) | 5 (2–9) |
| Male sex of the child (%) | 9210 (57) |
| Median length of hospitalization, days (IQR) | 3 (2–4) |
| ICD-10 AM coding of RSV-coded hospitalizations | |
| RSV bronchiolitis (%) | 15 393 (95·5) |
| RSV pneumonia (%) | 643 (4) |
| RSV bronchitis (%) | 83 (0·5) |
BPD, Bronchopulmonary dysplasia; GA, gestational age; IQR, interquartile range; RSV, respiratory syncytial virus.