Trivalent inactivated split virus influenza vaccine N = 4011 | Placebo N = 2003 | Vaccine efficacy | |||||||
---|---|---|---|---|---|---|---|---|---|
% | 95% CI† | p value † | |||||||
Number of events | Number of subjects reporting at least one event | % Attack rate | Number of events | Number of subjects reporting at least one event | % Attack rate | LL | UL | ||
254 | 240 | 6.0 | 120 | 113 | 5.6 | -6.1 | -33.8 | 15.5 | 0.642 |