Table 4 Factors associated with the transmissibility of COVID-19 among 525 primary cases using Poisson regression model
Factors | N | Univariate analysis | Multivariate analysis# | ||
|---|---|---|---|---|---|
EXP(β) (95%CI) | P-value | EXP(β) (95%CI) | P-value | ||
Incubation | |||||
Normal | 475 | 1 | – | 1 | – |
Prolonged | 50 | 0.515 (0.331, 0.803) | 0.003 | 0.504 (0.323, 0.786) | 0.002 |
Sex | |||||
Female | 252 | 1 | – | ||
Male | 273 | 1.064 (0.869, 1.304) | 0.546 | ||
Age, year | |||||
0–45 | 244 | 1 | – | 1 | – |
46–60 | 165 | 1.270 (1.002, 1.610) | 0.048 | 1.241 (0.978, 1.575) | 0.076 |
> 60 | 116 | 1.701 (1.320, 2.192) | < 0.001 | 1.826 (1.415, 2.357) | < 0.001 |
Geographical Location | |||||
Northern | 139 | 1 | – | 1 | – |
Central | 246 | 0.468 (0.375, 0.583) | < 0.001 | 0.469 (0.377, 0.583) | < 0.001 |
Southern | 140 | 0.458 (0.353, 0.594) | < 0.001 | 0.478 (0.368, 0.620) | < 0.001 |
Type of residence | |||||
Urban area | 354 | 1 | – | No significant and excluded | |
Rural area | 171 | 1.375 (1.126, 1.678) | 0.002 | ||
Underlying disease | |||||
None | 371 | 1 | – | No significant and excluded | |
Cardia-cerebrovascular | 76 | 1.235 (0.947, 1.610) | 0.119 | ||
Diabetes | 27 | 1.622 (1.114, 2.363) | 0.012 | ||
Other disease | 83 | 1.237 (0.963, 1.589) | 0.096 | ||
Clinical severity | |||||
Non-severe | 444 | 1 | – | No significant and excluded | |
Severe | 81 | 1.821 (1.437, 2.309) | < 0.001 | ||
Epidemic phase | |||||
Before Level I response | 76 | 1 | – | 1 | – |
After Level I response | 449 | 0.436 (0.351, 0.542) | < 0.001 | 0.496 (0.398, 0.619) | < 0.001 |