PDF file - Department of Health and Ageing

Invasive pneumococcal disease in Australia, 2004
Annual report
Estimates of the Indigenous Australian population
were based on projections from the 2001 census.
The ABS calculated projections based on assumptions
about future births, deaths and migrations in
the Indigenous population and a ‘low’ and ‘high’
estimate were reported. The ‘low’ estimate has been
used in this report, consistent with the reporting of
other national communicable diseases.
Figure 1. Notifications of invasive pneumococcal
disease, Australia, 2004, by month of
report and age group
400
350
300
Total cases
=5 years
The significance of differences in rates was calculated
using the Chi-square test with Yates correction.
Results
There were 2,375 notifi cations of IPD to NNDSS in
2004; a 9.2 per cent increase over the number of
notifi cations in 2003. The number of notifi cations
and notifi cation rate per 100,000 population are
shown in Table 4.
Notifications
250
200
150
100
50
0
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Month
The notifi cation rates for IPD varied between
7.8 and 17 cases per 100,000 population except in
the Northern Territory where the notifi cation rate was
46.5 cases per 100,000 population. The number of
notifi cations in 2004 was fewer in Victoria compared
with the total in 2003, but increased in all other jurisdictions.
When notifi cation rates of IPD were examined by
geographical distribution, variation within States
was apparent (Map).
The number of notifi cations of IPD was greatest in
the winter months with the peak number of notifi -
cations in August (342 notifi cations). The effect of
season was more evident in the distribution of cases
aged fi ve years or more compared with younger
children (Figure 1).
Figure 2. Notification rates of invasive
pneumococcal disease, Australia, 2004, by age
group and sex
Rate per 100,000 population
70
60
50
40
30
20
10
0
Rate per 100,000 population
160
140
120
100
80
60
40
20
0