Fig. 4. Onset days since vaccination by sex. Most patients reported cardiovascular symptoms during the first few days after vaccination. (A) After the first vaccine dose, 68.1% of males and 61.8% of females reported symptoms within 3 days. The latest onset days were 23 and 33 days in males and females, respectively. (B) After the second dose, 77.3% of males and 74.0% of females reported adverse reactions within 3 days. The latest onset days were 30 and 38 days in males and females, respectively.