Table 3. Seasonal average, number and rates of MAICC events averted among those aged ≥ 65 years, by season, Portugal, Spain and the Netherlands, influenza seasons 2015/16–2017/18.
| Country | Indicator | 2015/16 | 2016/17a | 2017/18 | Average |
|---|---|---|---|---|---|
| Portugal | NAE (95% CI) | 650 (265–1,162) | 527 (−746 to 1,876) | 967 (316–1,701) | 715 (215–1,246) |
| Rate NAE/105 (95% CI) | 30 (13–52) | 24 (−35 to 85) | 44 (15–77) | 33 (9.9–57.3) | |
| PF in % (95% CI) | 20.3 (10.7–28.4) | 4.9 (−7.9 to 15.1) | 14.5(5.4–21.9) | 10.7 (3.3–16.4) | |
| Spain | NAE (95% CI) | 5,268 (2,453–8,224) | 2,073 (−2,657 to 6,758) | 7,787 (2,891–12,648) | 5,042 (2,602–7,500) |
| Rate NAE/105 (95% CI) | 61 (29–96) | 24 (−30 to 78) | 88 (33–143) | 58 (30–86) | |
| PF in % (95%CI) | 19.1 (10.1–26.4) | 5.0 (−7.1 to 14.5) | 11.1 (4.4–16.9) | 10.9 (5.9–15.3) | |
| Netherlands | NAE (95% CI) | 8,483 (3,396–16,255) | 2,194 (−2,141 to 7,524) | 8,694 (1,158–17,487) | 6,457 (2,310–12,013) |
| Rate NAE/105 (95% CI) | 275 (110–527) | 69 (−68 to 238) | 268 (36–540) | 204 (74–380) | |
| PF in % (95% CI) | 24.7 (12.7–34.6) | 6.1 (−6.7 to 16.8) | 11.8 (1.8–20.3) | 14.2 (5.2–21.5) |
CI: confidence interval; MAICC: medically attended influenza-confirmed cases; NAE: Number of averted MAICC events; PF: prevented fraction.
a Negative lower bounds of 95% CI for NAE, averted rate and PF in 2016/17 season reflect the uncertainty around the point estimates and should not be interpreted as ‘negative impact’.
Parameter point estimates from Table 2 were used to calculate the point estimates of NAE, averted rate and PF.