Table 3.

Potential risk factors associated with NT₅₀ for serum SARS-CoV-2 neutralizing antibody during follow-up.

Variables	β (SE)	P-value
Number of any symptom	0.126 (0.045)	0.005
CT scores of ground-glass opacity	0.045 (0.017)	0.009
CT scores of reticular pattern	0.045 (0.015)	0.004
Depression score	-0.002 (0.015)	0.901
Anxiety score	0.019 (0.018)	0.276

Linear mixed model of repeated measures was conducted to estimate fixed effects of any symptom, CT scores, and mental health disorders on log-transformed NT₅₀ of SARS-CoV-2 neutralizing antibody, adjusted for age, gender, and vaccination. Random effects consisted of days of the neutralizing antibody test after symptom onset and days of the first shot of the COVID-19 vaccine since symptom onset of each participant. The number of any symptoms refers to the number of sequelae of a participant.

CT: computed tomography; NT₅₀, the half-maximal inhibitory concentration; SE, standard error of the beta coefficient.