Table 5 Crude and adjusted vaccine effectiveness of seasonal vaccine against influenza by year, age group and type/subtype, 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) |