Figure 4. Epidemiologic features of Kawasaki disease in 2020 in Yamanashi. (A) Statistical process control chart of monthly changes in the number of cases. The dotted sequential line shows the average of monthly cases in the previous 5 years (2015–19). The closed bars indicate the number of monthly cases from December 2019 through November 2020. The solid and dotted straight lines indicate the mean, −1 SD, and −2 SD of monthly cases in the previous 5 years, respectively. (B) Bar plots comparing monthly cases between 9 months (March through November) of 2020 (n = 9) and the corresponding 9 months of the previous 5 years (n = 45). P-values in the Mann–Whitney U test are indicated. SD, standard deviation.
