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Number needed to vaccinate in High dose influenza vaccine vs Standard dose influenza vaccine.
| Laboratory Confirmed Influenza cases/Total participants | ARR (from 7.2% background rate) | NNV (1/ARR) |
|
|---|---|---|---|
| High Dose Vaccine- Influenza Incidence Rate | 228/ 15,990 = 0.01426 | 0.072–0.01426 = 0.05574 | 1/0.05574 = 18 |
| Standard Dose Vaccine- Influenza Incidence Rate | 301/ 15,993 = 0.01882 | 0.072–0.01882 = 0.05318 | 1/0.05318= 19 |
ARR, Absolute risk reduction; NNV, Number Needed To Vaccinate.
