Table 2 Univariate regression analyses of risk factors for illness.
Variable | Classification criteria | Crude OR | 95% CI | P value |
|---|---|---|---|---|
Age (years) | ≤ 40 | 1.0 | ||
40–60 | 0.307 | 0.104–0.905 | P < 0.050 | |
> 60 | 0.071 | 0.026–0.194 | P < 0.001 | |
Sex | Male | 1.0 | ||
Female | 0.257 | 0.135–0.488 | P < 0.001 | |
Comorbidities | No | 1.0 | ||
Yes | 0.241 | 0.135–0.432 | P < 0.001 | |
Smoking status | No | 1.0 | ||
Yes | 0.960 | 0.391–2.359 | P = 0.929 | |
Respiratory rate | ≤ 30 | 1.0 | ||
> 30 | 8.085 | 3.263–20.033 | P < 0.001 | |
Oxygen saturation | ≥ 93% | 1.0 | ||
< 93% | 1.764 | 0.969–3.211 | P = 0.063 | |
WBC (× 109/L) | 0.987 | 0.954–1.021 | P = 0.443 | |
Lymphocyte (× 109/L) | 1.224 | 0.755–1.983 | P = 0.412 | |
C-reactive protein (mg/L) | < 20 | 1.0 | ||
≥ 20 | 1.160 | 0.630–2.137 | P = 0.633 | |
Respiratory support | COT | 1.0 | ||
HFNC | 0.171 | 0.087–0.337 | P < 0.001 | |
NIV | 0.125 | 0.060–0.261 | P < 0.001 | |
Time from symptom onset to severe status | ≤ 7 | 1.0 | ||
> 7 | 0.213 | 0.118–0.384 | P < 0.001 |
