Table 4.
Factors independently associated with seasonal influenza vaccine failures among cases aged 60 years and older, Germany, seasons 2010/11-2012/13
| 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 |
OR, Odds ratio; 95% CI, 95% confidence interval; ns, not statistically significant.
1Influenza season defined as from week 40 of the previous year to week 20 in the following year.
2Removing this (non-significant) variable did not influence the final model.