3. Results
A total of 350 subjects who received three COVID-19 vaccines participated in this study. Subjects were allocated to the KRG group (Pearson’s correlation analysis was used to evaluate the association of anti-N-Ab and other covariates four weeks after the first dose (baseline). Age and vitamin D level were inversely correlated with anti-N-Ab (Age: r = −0.279, Common patterns of antibody response are shown in AUCs using a linear trapezoidal rule revealed statistically significant differences between the two groups for changes in anti-N-Ab over time. 