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Table 2 Reduction in expected event rates of TIV-unmatched influenza B by QIV versus TIV in Hong Kong elderly

From: Cost-effectiveness analysis of quadrivalent influenza vaccine versus trivalent influenza vaccine for elderly in Hong Kong

Year Rate reduction (per 100,000)
  Symptomatic influenza Outpatient Hospitalization Dead
Age 65–79 years
2001 2.6809 2.6582 0.0227 0.0013
2002* 0.0000 0.0000 0.0000 0.0000
2003 3.7933 3.7611 0.0321 0.0019
2004 282.0652 279.6748 2.3904 0.1410
2005 84.4697 83.7538 0.7158 0.0422
2006 27.5809 27.3472 0.2337 0.0138
2007 282.9799 280.5818 2.3981 0.1415
2008 201.6311 199.9223 1.7087 0.1008
2010 58.1889 57.6958 0.4931 0.0291
Age ≥80 years
2001 1.9449 1.9285 0.0165 0.0010
2002* 0.0000 0.0000 0.0000 0.0000
2003 42.1055 41.7487 0.3568 0.0211
2004 838.6402 831.5331 7.1071 0.4193
2005 204.2730 202.5419 1.7311 0.1021
2006 49.7802 49.3583 0.4219 0.0249
2007 1540.4373 1527.3828 13.0546 0.7702
2008 1032.5602 1023.8097 8.7505 0.5163
2010 352.9492 349.9581 2.9911 0.1765
  1. *In 2002, no influenza B virus was identified from patients admitted to the Prince of Wale Hospital for age groups 65–79 years and ≥80 years. The expected reductions in event rates were considered as zero.
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BMC Infectious Diseases

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