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Table 2 Study inclusion and exclusion criteria by year, 2007-2008

From: Estimation of type- and subtype-specific influenza vaccine effectiveness in Victoria, Australia using a test negative case control method, 2007-2008

Criteria 2007 2008
  Excluded Included Excluded Included
Inclusion     
   Respiratory swabs of ILI patients submitted by GPs 0 480 0 407
Exclusion     
   Influenza result unknown 0 480 0 407
   Vaccination status unknown 8 472 4 403
   Symptom onset to specimen collection interval unknown 41a 434 22a 384
   > 4 days between symptom onset and specimen collection 50b 386 54 330
  1. a includes 3 patients with unknown vaccination status
  2. b includes 2 patients with unknown vaccination status