Table 2 Univariate and multivariate logistic regression analyses for the risk factors associated with viral shedding time > 14 days in the training set

Age (per 10 years)

1.503 (1.358–1.671)

< 0.001

1.293 (1.147–1.463)

< 0.001

Gender

 Female

1.00

-

 Male

1.010 (0.724–1.411)

0.954

Body mass index (per point)

0.986 (0.940–1.034)

0.564

Vaccination

 Reference*

1.00

-

1.00

-

 Fully vaccinated

0.270 (0.170–0.420)

< 0.001

0.629 (0.416–0.952)

0.028

 Boosted

0.278 (0.182–0.420)

< 0.001

Symptomatic

 No

1.00

-

 Yes

0.827 (0.590–1.161)

0.272

Disease severity

 Reference^†

1.00

-

1.00

-

 Moderate

2.143 (1.475–3.116)

< 0.001

1.155 (0.749–1.772)

0.511

Charlson comorbidity index (per point)

1.581 (1.390–1.811)

< 0.001

1.247 (1.075–1.455)

0.004

Antiviral treatment

 No

1.00

-

 Yes

0.570 (0.331–0.949)

0.036

0.558 (0.314–0.961)

0.040