Fig. 3. Distribution of patients after the first and second vaccine dose. A total of 70.8% of males and 65.7% of females visited the ED following the first vaccine dose. (A) In males, the number of visits was larger after the first dose than after the second dose in all age groups, except for the 17–19 age group. Males in their 20s visited the ED four time more frequently after the first than after the second (P < 0.001). (B) Females also visited the ED more often after the first dose, except for those in the 17–19 and 60–65 age groups (P = 0.110).

ED = emergency department.