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Table 4 Factors independently associated with seasonal influenza vaccine failures among cases aged 60 years and older, Germany, seasons 2010/11-2012/13

From: Application of the screening method to monitor influenza vaccine effectiveness among the elderly in Germany

Season

Influenza-type

Variable/Category

Adjusted OR (95% CI)

p-value

2010/11

A(H1N1)

Age in years

1.03 (1.00-1.07)

0.04

  

Weeks since begin influenza season1

1.02 (0.94-1.11)

0.672

  

Hospitalization

0.45 (0.28-0.73)

<0.01

2011/12

A(H3N2)

Age in years

1.07 (1.03-1.12)

<0.01

  

Weeks since begin influenza season1

1.12 (1.01-1.26)

0.03

  

Hospitalization

0.23 (0.09-0.62)

<0.01

2012/13

A(H1N1)

Age in years

1.05 (1.02-1.08)

<0.01

  

Weeks since begin influenza season1

1.02 (0.95-1.11)

0.492

  

Hospitalization

0.51 (0.33-0.80)

<0.01

 

A(H3N2)

Age in years

1.06 (1.02-1.11)

<0.01

  

Weeks since begin influenza season1

1.11 (0.98-1.26)

0.082

  

Hospitalization

0.35 (0.12-1.00)

0.05

  1. OR, Odds ratio; 95% CI, 95% confidence interval; ns, not statistically significant.
  2. 1Influenza season defined as from week 40 of the previous year to week 20 in the following year.
  3. 2Removing this (non-significant) variable did not influence the final model.