Figure 1.
Venn diagram schematically showing the linked dataset, indicated by a dashed line, that was used to assess whether persons with a virological notification of influenza had influenza recorded as a cause of illness on their death, admission or ED presentation record, if any.
Notes: 1. The size of each circle and degree of overlap are illustrative only and not drawn to scale. 2. Only laboratory results within ±84 days of a death, and within ±28 days of an admissions or ED presentation were included.
Figure 2.
Venn diagrams schematically showing the linked datasets, indicated by dashed lines, used for assessing whether influenza recorded on the databases was based on a laboratory finding.
The datasets included persons with A. certified influenza deaths; B. coded influenza hospital admissions; and C. coded influenza ED presentations and any notification (serological or virological) records for the same persons. Notes: 1. The size of each circle and degree of overlap are illustrative only and not drawn to scale. 2. Only laboratory results within ±84 days of a death, and within ±28 days of an admissions or ED presentation were included.
Figure 3.
Time series of weekly counts of virological notifications and of those with an any-cause death registration, hospital admission or emergency department (ED) presentation, NSW, Australia, 2005–2008.
Table 1.
Descriptive comparison of all virological notifications (VN), those with an any-cause ED presentation, hospital admission or death registration, and of coded influenza and certified influenza deaths in the databases, New South Wales, Australia, 2005–2008.
Table 2.
Factors1 independently associated with having coded influenza2 in any diagnosis on the admission record among persons with an any-cause hospital admission and a virological notification, New South Wales, 2005 to 2008.
Table 3.
Logistic regression analysis of factors1 independently associated with having coded influenza2 in the ED provisional diagnosis among persons with an any-cause ED presentation and a virological notification, New South Wales, 2005 to 2008.
Figure 4.
Time series of weekly counts of persons with: emergency department (ED) presentations with coded influenza; hospital admissions with coded influenza; influenza certified deaths; and those that also had a virological notification, New South Wales, Australia, 2005–2008.