Figure 2

Groups according to the number of systemic adverse reactions after the second and third vaccinations (Nā=ā2199). We classified participants into nine groups according to the number of systemic adverse reactions (0, 1, or more than 2) after the second and third vaccinations. Systemic adverse reactions were defined as fatigue, headache, muscle/joint pain, diarrhea, nausea, and dizziness. Group numbers were defined so that the larger the number of systemic adverse reactions, the larger the group number; for example, G1 was for those without systemic adverse reactions after the second and third vaccinations, and G9 was for those with multiple systemic adverse reactions after both vaccinations, among others.