Table 2.
Estimated annual varicella and zoster pre-vaccination incidence and percent hospitalized, and actual annual hospitalization rates and mean length of stay in hospital by age group for Australia
| Age group (years) | ||||||||
|---|---|---|---|---|---|---|---|---|
| 0–4 | 5–14 | 15–24 | 25–34 | 35–49 | 50–79 | ⩾80 | Total | |
| Varicella | ||||||||
| Incidence (per million)* | 105 045 | 37 660 | 3680 | 3185 | 1162 | 249 | 60 | 13 292 |
| Hospitalization rate (per million)† | 314 | 65 | 45 | 51 | 17 | 9 | 10 | 52 |
| % Hospitalized‡ | 0·3 | 0·2 | 1·2 | 1·6 | 1·5 | 3·6 | 16·7 | 0·4 |
| Mean length of stay in hospital (days) | 2·5 | 3·2 | 3·3 | 3·7 | 4·2 | 7·2 | 9·3 | 3·4 |
| Zoster | ||||||||
| Incidence (per million)* | 216 | 1262 | 3004 | 3818 | 3956 | 4967 | 5360 | 3546 |
| Hospitalization rate (per million)† | 14 | 19 | 14 | 21 | 34 | 212 | 1 026 | 97 |
| % Hospitalized‡ | 6·5 | 1·5 | 0·5 | 0·6 | 0·9 | 4·3 | 19·1 | 2·7 |
| Mean length of stay in hospital (days) | 3·9 | 3·5 | 4·2 | 4·1 | 5·1 | 6·9 | 10·3 | 7·5 |
*
Incidence estimated from the model where vaccination coverage = 0%.
†
Principal diagnosis of varicella (ICD-10-AM code B01) or zoster (ICD-10-AM code B02) for financial years 1996/1997 to 1998/1999. [Source: Australian Institute of Health and Welfare (AIHW) National Hospital Morbidity database.]
‡
Percent hospitalized = (hospitalization rate/incidence) × 100.