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Table 5 Crude and adjusted vaccine effectiveness of seasonal vaccine against influenza by year, age group and type/subtype, 2007-2008

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

  Influenza vaccine effectiveness (95% CI)
  All A/H1 A/H3 B
2007     
   Crude 57 (27, 75) 46 (-28, 77) 64 (29, 81) 76 (-7, 94)
   Adjusteda     
0-19 -98 (-1906, 80) -333 (-5401, 66) -7 (-1850, 94) Not defined
20-64 64 (29, 82) 48 (-65, 84) 69 (29, 87) 85 (-19, 98)
≥ 65 74 (-283, 98) Not defined 84 (-156, 99) Not defined
All ages 59 (25, 78) 27 (-92, 72) 68 (32, 85) 84 (-2, 98)
2008     
   Crude 26 (-40, 61) -49 (-1367, 85) -59 (-254, 28) 68 (7, 89)
   Adjusteda     
0-19 -441 (-7774, 63) Not defined Not defined -314 (-6713, 75)
20-64 35 (-56, 73) -88 (-1936, 83) -17 (-255, 62) 71 (-32, 93)
≥ 65 Not defined Not defined Not defined Not defined
All ages 9 (-96, 58) -88 (-1936, 83) -66 (-349, 39) 49 (-58, 84)
  1. a adjusted for month of swab collection