Figure 2. Incremental cost effectiveness ratio (ICER) of two potential strategies to increase influenza vaccination coverage rates among children by age groups in China comparing with the base situation of current policy.

OPTION One includes a single telephone vaccination reminder. OPTION Two includes comprehensive measures of free vaccination voucher, and expanding vaccination sites in hospital clinics. The bars in each column shows the ranges due to differences in input values such as rates of influenza like illness (ILI), vaccine effectiveness, and program costs (c.f., Tables 1 and 2).