Unadjusted analysis | Adjusted analysis | |||||
---|---|---|---|---|---|---|
Type of infection | No. of subjects | No. (%) of vaccinated | ORa (95% CI) | Effectiveness of vaccination % (95% CI) | ORb (95% CI) | Effectiveness of vaccination % (95% CI) |
Within influenza period (January-April) | (c) | |||||
Case patients | 50 | 17 (34.0) | 0.30 (0.12-0.73) | 70% (27-88) | 0.27 (0.08-0.85) | 73% (15-92) |
Control subjects | 100 | 55 (55.0) | p = 0.008 | p = 0.025 | ||
Within non-influenza period (May-December) | (d) | |||||
Case patients | 38 | 17 (44.7) | 0.38 (0.16-0.92) | 62% (8-84) | 0.37 (0.15-0.92) | 63% (8-85) |
Control subjects | 76 | 49 (64.5) | p = 0.032 | p = 0.033 |