Figure 2.
Fold increase in the anti-S IgG titer after the third dose in each responder status group. (a) The box and whisker chart shows a fold increase in the anti-S IgG titer after the third dose in each responder status group compared with that after the second dose in the HD group. The whisker on the upper side is the maximum in the nonresponder group and is drawn to 1.5 times the interquartile range larger than the third quartile in the low/high responder groups. The whisker on the lower side is the minimum. The Kruskal–Wallis test was performed to compare all 3 groups. A post hoc analysis was performed using the Bonferroni test to compare 2 groups. ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001. (b) The box and whisker chart shows a fold increase in the anti-S IgG titer after the third dose in each responder status group compared with that after the second dose in the HCW group. The whiskers on the upper side are drawn to 1.5 times the interquartile range larger than the third quartile and the ones on the lower side are minimum. The Mann–Whitney U-test was performed to compare the low responder and high responder groups. ∗∗∗P < 0.001. HCW, health care worker; HD, hemodialysis.
