Asthma in Australia 2008 
Figure 5.17
Emergency department visits for asthma per 100,000 population, by age and month, New South Wales, January 1999 to December 2007
Notes
1. As the coverage of the emergency department (ED) data is less than 100%, these rates will be an underestimate of the true ED visit rate among people with asthma.
2. Data contains a mix of diagnoses coded using International Classification of Diseases, 9th and 10th revisions (ICD-9 and ICD-10). Comparability factors, calculated from hospitalisation data (see Appendix 1, Section A1.9.3) have been used to adjust for the changes in coding from ICD-9 to ICD-10. ED visits coded to ICD-9 were converted to ICD-10 using the following conversions: ages 0–5 years, no conversion; 5–34 years, converted by a factor of 1.0326; 35–64 years, converted by a factor of 0.7938; 65 years and over, converted by a factor of 0.4813.
Sources: New South Wales (NSW) Emergency Department Data Collection (EDDC) Health Outcomes and Information Statistical Toolkit (HOIST), Centre for Epidemiology and Research, NSW Department of Health; Australian Bureau of Statistics.
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