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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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