Figure 2.

The boxplots, showing the differences for the ELISA values of N, RBD, and S2 proteins among the patients who needed oxygen support and those who did not. The ‘Yes’ group, indicating patients who used any oxygen tools (either nasal cannula or supplementary oxygen) and the ‘No’ group, consisting of patients without any oxygen tool interventions. The two numbers in braces for each group indicated the number of Elisa samples and patients correspondingly. The p-values were produced by performing ANOVA tests for each of the two groups.