Table 5. Variables associated with the odds of having been infected with influenza type B vs. A viruses.
Multivariable logistic regression analysis adjusted by season. The IBVD (Influenza B in Vircases database) study, France, 2003–2004 to 2012–2013.
| Characteristics | OR [95% CI] | P Value |
|---|---|---|
| Gender: | ||
| Female | Reference | |
| Male | 0.89 [0.80–0.98] | 0.023 |
| Age: | ||
| 0–4 years | Reference | |
| 5–14 years | 2.15 [1.87–2.47] | < .001 |
| 15–64 years | 0.83 [0.73–0.96] | 0.010 |
| >65 years | 1.12 [0.80–1.58] | 0.501 |
| No. of signs and symptoms a : | ||
| < 7 | Reference | |
| ≥ 7 | 0.94 [0.85–1.05] | 0.287 |
| Diagnosed during the epidemic period: | ||
| No | Reference | |
| Yes | 0.38 [0.33–0.43] | < .001 |
a Signs and symptoms included were as follows: sudden onset of symptoms, asthenia, myalgia, shivering, cephalalgia, cough, expectoration, bronchitis/bronchiolitis, rhinitis, pharyngitis, otitis/earache, gastrointestinal symptoms, dyspnea, conjunctivitis, adenopathy.