Excess risk of Guillain-Barré syndrome (GBS) per 1,000,000 influenza vaccinations by influenza incidence rate, age, and vaccine effectiveness for both sexes combined. A) Risk for persons <18 years of age; vaccine effectiveness of 40%–80%. B) Risk for persons 45 years of age; vaccine effectiveness of 40%–80%. C) Risk for persons 60 years of age; vaccine effectiveness of 20%–80%. D) Risk for persons 75 years of age; vaccine effectiveness of 20%–80%. Depending on the joint distribution of the probabilistic inputs to the simulation model, these deterministic sensitivity analyses will not necessarily yield identical mean/median estimates to those from the probabilistic simulation for the same age, sex, and influenza incidence rate.