Figure 2

Multivariate linear regression results for anti-spike (S) protein IgG antibody titers after the second dose of mRNA COVID-19 vaccine. Model P < 0.0001, R2 = 0.7542. *Comorbidities with fewer than 20 participants (heart disease, stroke, chronic obstructive lung disease, renal failure requiring dialysis, cancer) were excluded from the analysis. Variables were selected using the stepwise method (P < 0.25). SARS-CoV-2 severe acute respiratory syndrome coronavirus 2, RoM ratios of means, CI confidence interval, IgG immunoglobulin G.