Fig. 2.

Linear mixed model for the SARS-CoV-2 IgG antibodies decline. A) Overall mean trajectory from the baseline observed level. Mean trajectory and 95% confidence interval are shown as solid line and dashed area. The dashed grey line represents the limit of the observed period of time and the dashed red line represents the titer threshold of 1.1 A.U. B) Comparison of baseline observed titers and the estimated antibody half-life per subject.