Variables  Univariate analysis  Multivariate analysis
OR  95% CI  P valúe  OR  95% CI  P valúe
Age  1.03  1.01 to 1.06  0.009
Female gender  2.41  1.31 to 4.45  0.005
Doctor  Ref  Ref  0.0001  Ref  Ref  <0.0001
Nurse  2.25  1.28 to 3.94   2.09  1.18 to 3.72
Other HCW  5.98  2.67 to 13.4   6.94  3.01 to 16.04
Filter mask versus surgical  2.08  1.07 to 4.07  0.026  2.14  1.07 to 4.32  0.027
Mornings and 24-hour duties  Ref  Ref  0.0001
Rotating shifts  3.35  1.81 to 6.23
Other work shifts  2.83  1.52 to 5.32
Asthma  0.33  0.12 to 0.92  0.03  0.29  0.09 to 0.89  0.026
Tobacco  3.13  1.39 to 7.01  0.003
Anxiety  2.34  0.91 to 6.05  0.063