Table 2.
Multivariate logistic regression analysis of positive antibody tests.
| Variables in the equation | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| B | SE | Wald | df | Sig. | OR | 95% Confidence interval of OR |
|||
| Lower | Upper | ||||||||
| Step 1 | Aerosol operation | .992 | .297 | 11.118 | 1 | .001 | 2.696 | 1.505 | 4.828 |
| Exposure levels | 1.660 | .298 | 31.142 | 1 | .000 | 5.262 | 2.937 | 9.428 | |
| Clinical symptoms | .109 | .281 | .150 | 1 | .698 | 1.115 | .643 | 1.935 | |
| Chest CT imaging changes | .492 | 1.028 | .229 | 1 | .632 | 1.636 | .218 | 12.267 | |
| Age | .015 | .017 | .754 | 1 | .385 | 1.015 | .982 | 1.048 | |
| Constant | −5.846 | .871 | 45.015 | 1 | .000 | .003 | |||
B: Regression coefficients; SE: Standard error; Wald: Chi-square value; df: Degrees of freedom; Sig: Significance; OD: Odds Ratio.