Table 4.
Risk factors for venous thromboembolism by univariable analysis.
| Variable | VTE: No | VTE: Yes | RR | Lower 95% CI | Upper 95% CI | P value | |
|---|---|---|---|---|---|---|---|
| Gender | Male | 908 | 9 | 1.811 | 0.670 | 4.897 | .274a |
| Female | 390 | 7 | |||||
| Any comorbidity | Yes | 439 | 9 | 2.516 | 0.931 | 6.8 | .068a |
| No | 859 | 7 | |||||
| Age, y median (IQR, range) | 52 (39-70, 19-99) | 52 (44-67, 22-80) | 0.996 | 0.970 | 1.023 | .774b | |
| Length of stay, d median (IQR, range) | 9 (6-14, 1-137) | 30 (15-36, 4-99) | 1.047 | 1.028 | 1.066 | <.001b | |
| Race/ethnicityc | Chinese | 571 | 11 | NA | NA | NA | NA |
| Malay | 123 | 2 | 0.844 | 0.185 | 3.856 | .827b | |
| Indian | 260 | 0 | 0 | 0 | 0 | .994b | |
| White | 18 | 1 | 2.884 | 0.353 | 23.555 | .323b | |
| Other | 326 | 2 | 0.318 | 0.07 | 1.446 | .138b | |
| COVID-19 waved | Wild-type | 613 | 5 | NA | NA | NA | NA |
| Delta | 224 | 7 | 3.831 | 1.204 | 12.194 | .023b | |
| Omicron | 461 | 4 | 1.064 | 0.284 | 3.983 | .927b | |
| COVID-19 wavee | Omicron | 461 | 4 | NA | NA | NA | NA |
| Wild-type | 613 | 5 | 0.94 | 0.251 | 3.52 | .927b | |
| Delta | 224 | 7 | 3.602 | 1.043 | 12.431 | .043b | |
| Severityf | Mild | 1103 | 7 | NA | NA | NA | NA |
| Moderate | 107 | 4 | 5.891 | 1.697 | 20.445 | .005b | |
| Critical | 88 | 5 | 8.953 | 2.784 | 28.788 | <.001b | |
| Severityg | Critical | 88 | 5 | NA | NA | NA | NA |
| Mild | 1103 | 7 | 0.112 | 0.035 | 0.359 | <0.001b | |
| Moderate | 107 | 4 | 0.658 | 0.171 | 2.525 | 0.542b | |
Bold font signifies a row with a significant P value <.05.
RR, relative risk; VTE, venous thromboembolism.
a
Fisher’s exact test.
b
Relative risk, 95% CI, and P value from logistic regression.
c
RR referenced to the Chinese group.
d
RR referenced to the wild-type strain.
e
RR referenced to the omicron variant.
f
RR referenced to mild infection.
g
RR referenced to critical infection.