Statistics
Differences between participants with and without SARS-CoV-2 infection
were analyzed using the Mann-Whitney U and chi-square tests with a
two-sided P value. Demographic variables and antibody responses were
also evaluated. Continuous outcome measures are summarized as median and
interquartile range (IQR), and antibody concentrations were
log10-transformed for the analysis. A P value of <0.05 was
considered significant.
The comparison of anti-S antibody and neutralizing antibody
concentrations was analyzed using the Kruskal-Wallis test followed by a
post-hoc Mann-Whitney U test. Statistical analysis was conducted using
SPSS version 28 and Prism version 7 (GraphPad). Temporal relationships
between antibody concentrations were plotted as quadratic curves using a
polynomial regression approach.