Figure 1.

Incidence and numerical rating scale (NRS) scores of post-vaccination headaches.(a) The incidence of post-vaccination headaches.

*Significant difference between groups.

#Significant difference between first and second vaccination doses within the group. Blue bars represent headache without fever and red bars represent headache with fever.

(b) NRS scores of post-vaccination headaches. Whiskers, full range; box, interquartile range; horizontal line, median. Grey, green, orange, and black represent healthy control, migraine, non-migrainous headache, and total, respectively.

*Significant difference between groups.

#Significant difference between first and second vaccination doses within the group.

Healthy: healthy control; non-migraine: non-migrainous headache.

*adjusted p < 0.05; **adjusted p < 0.01; ***adjusted p < 0.001; ^##p < 0.01; ^###p < 0.001.