Fig 1.
Flow chart for the study.
Table 1.
Characteristics of the PCR positive (PCR+) and PCR negative (PCR-) participants at the first antibody test (T1).
Table 2.
The duration and changes in total antibody levels against the SARS-CoV-2 spike protein measured with Index value three to five months (T1) and 10 to 12 months (T2) after PCR test for PCR positive (PCR+) and PCR negative (PCR-) participants.
Table 3.
The distribution of variables in PCR+ participants with detectable antibodies grouped as decreased, unchanged, increased, and antibody level ≥ 10 at time point T1 and T2.
Table 4.
Possible predictors for decreased antibodies after 10 to 12 months compared with increased, unchanged and antibody ≥ 10 using univariate analysis adjusted for age and sex, and multivariate analysis adjusted for all variables.