showed a trendp = 0.07
There was no significant decay of anti-S trimer IgG over time (delta per month: −0.02, p = 0.5); however, anti-RBD antibody showed a trend toward slight decay over time (delta per month: −0.04, p = 0.07), and anti-NP significantly decayed over time (delta per month: −0.15, p < 0.001).