Figure 2.

Incidence of acute and post-COVID-19 symptoms in epidemic periods

A. Number of headaches, malaise/fatigue, depression, disuse syndrome, taste disorder, olfactory disorder, and alopecia cases in acute (within two weeks of diagnosis) and post-COVID-19 (2-12 weeks after diagnosis). The numbers are displayed at the tip of the bars. B. Incidence of acute and post-COVID-19 symptoms in three observation periods, along with major epidemic strain and vaccination status. The p-value was calculated using the chi-squared or Fisher’s exact tests and then compared with a corrected significance level using Bonferroni’s method (α′). Asterisks and a dagger indicate that the p-value between the two groups was less than α′ using different original significance level (α); **** α = 0.0001, *** α = 0.001, ** α = 0.01, * α = 0.05, and † α = 0.1. ns represents no significance.