Table 4 Association between selected factors and latent as well as incubation periods using multivariate AFT model

Sex

Male

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

Female

1.01 (0.91 ~ 1.13)

0.839

0.95 (0.87 ~ 1.05)

0.334

0.99 (0.88 ~ 1.11)

0.887

0.97 (0.88 ~ 1.07)

0.546

Age

0 ~ 17

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

18 ~ 49

0.81 (0.66 ~ 0.98)

0.034

0.82 (0.71 ~ 0.94)

0.004

0.69 (0.55 ~ 0.86)

< 0.001

0.83 (0.72 ~ 0.96)

0.013

50~

1.04 (0.87 ~ 1.25)

0.669

1.07 (0.92 ~ 1.26)

0.373

0.89 (0.71 ~ 1.10)

0.270

0.95 (0.80 ~ 1.14)

0.593

Vaccination history

Unvaccinated

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

Partially vaccinated

0.97 (0.85 ~ 1.11)

0.676

1.05 (0.78 ~ 1.41)

0.757

0.96 (0.84 ~ 1.11)

0.606

0.98 (0.75 ~ 1.27)

0.856

Fully vaccinated

0.98 (0.85 ~ 1.13)

0.789

1.07 (0.88 ~ 1.28)

0.501

1.00 (0.86 ~ 1.16)

0.962

1.03 (0.86 ~ 1.23)

0.751

Booster

··

··

0.97 (0.81 ~ 1.17)

0.780

··

··

1.02 (0.85 ~ 1.21)

0.864

Clinical severity

Asymptomatic

1 (ref)

··

1 (ref)

··

NA

NA

NA

NA

Mild

1.35 (0.90 ~ 2.04)

0.148

1.00 (0.89 ~ 1.13)

0.969

1 (ref)

··

1 (ref)

··

Moderate/Severe/Critical

1.23 (0.83 ~ 1.83)

0.304

0.99 (0.84 ~ 1.17)

0.914

1.02 (0.86 ~ 1.20)

0.864

1.07 (0.91 ~ 1.26)

0.395

Number of infectors

> 1

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

= 1

0.92 (0.81 ~ 1.04)

0.190

0.96 (0.87 ~ 1.05)

0.378

0.90 (0.79 ~ 1.03)

0.133

0.99 (0.90 ~ 1.10)

0.904

Exposure window

≤ 3 days

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

> 3 days

1.06 (0.94 ~ 1.19)

0.359

1.51 (1.35 ~ 1.70)

< 0.001

1.05 (0.92 ~ 1.19)

0.469

1.48 (1.32 ~ 1.66)

< 0.001

Shedding window

≤ 3 days

1 (ref)

··

1 (ref)

··

1 (ref)

··

1 (ref)

··

> 3 days

0.80 (0.70 ~ 0.90)

< 0.001

0.85 (0.71 ~ 1.02)

0.081

0.96 (0.86 ~ 1.07)

0.469

1.21 (1.08 ~ 1.36)

0.001

Omicron sublineages

BA.1

NA

NA

1 (ref)

··

NA

NA

1 (ref)

··

BA.2

NA

NA

0.99 (0.88 ~ 1.12)

0.886

NA

NA

1.03 (0.90 ~ 1.18)

0.648