FIGURE 2.

Adjusted cVE for the SD cell‐based influenza vaccine compared to the SD egg‐based vaccine. CI = confidence interval; cVE = comparative vaccine effectiveness (SD cell‐based vs. SD egg‐based); PCR = polymerase chain reaction; SD = standard dose. ^aWeighted using stabilized inverse probability of treatment weights. When the hazard ratio or its 95% CI was > 1, the cVE (%) or its 95% CI was transformed as ([1/hazard ratio] − 1) × 100. ^bPCR‐confirmed influenza‐related hospitalization (a positive PCR test collected between −14 and +3 days from the inpatient admission date) with an acute respiratory infection code [9].