Logistic regression model of predictors of seropositivity
| Risk factors | Odds ratio (95% CI) for seropositivity | P-value |
|---|---|---|
| Recalled having influenza that winter | 1.9 (1.3 to 2.8) | 0.0005 |
| Had a seasonal influenza vaccine | 2.0 (1.2 to 3.3) | 0.0080 |
| Age group, years | ||
| ≤45 | 1.4 (1.0 to 1.9) | 0.0290 |
| >45 | Reference | |