Table 2

Multiple logistic regression model incorporating seropositivity at time of study as the dependent variable and age, sex, ethnicity, Index of Multiple Deprivation score and department in which participants worked at the time of the study as independent variables

Variable	Unadjusted OR	95% CI	P value	Z	Adjusted OR	95% CI	Z	P value
Age	–	–		–	0.98	0.96 to 1.00	0.60	0.55
Sex (female)	1.54	0.94 to 2.56	0.09	1.72	1.49	0.81 to 2.83	1.79	0.07
Ethnicity (BAME)	1.58	1.01 to 2.49	0.05	1.97	1.92	1.14 to 3.23	1.26	0.01
Index of Multiple Deprivation score	–	–	–		0.99	0.74 to 1.32	2.46	0.95
Acute medicine	1.60	0.76 to 3.37	0.24	1.17	0.99	0.34 to 2.86	0.01	0.99
Emergency department	0.47	0.10 to 1.81	0.31	1.01	0.36	0.05 to 1.69	1.19	0.23
Estates	0.61	0.18 to 2.00	0.43	0.78	0.57	0.11 to 2.29	0.75	0.45
General internal medicine	1.45	0.89 to 2.32	0.13	1.52	0.93	0.42 to 2.12	0.17	0.86
General surgery	0.45	0.14 to 1.37	0.19	1.30	0.24	0.03 to 1.05	1.71	0.09
Facilities	0.71	0.29 to 1.63	0.41	0.81	0.52	0.15 to 1.60	1.10	0.45
Housekeeping	1.68	0.79 to 3.62	0.19	1.30	1.01	0.31 to 3.09	0.02	0.99
Intensive care	0.50	0.24 to 1.01	0.06	1.87	0.28	0.09 to 0.78	2.37	0.02
Obstetrics and gynaecology	1.34	0.63 to 2.71	0.44	0.78	0.85	0.30 to 2.39	0.30	0.77
Research and development	0.71	0.33 to 1.50	0.38	0.88	0.44	0.15 to 1.22	1.54	0.12

Unadjusted OR and adjusted OR following multiple logistic regression are presented. OR presented for individual hospital departments represents the odds of seropositivity for individuals working in that department compared with not working in that department. Statistically significant OR are in bold (p<0.05)
The area under the receiver operating characteristic curve of this model was 0.675 (95% CI 0.619 to 0.732, p<0.0001).
BAME, Black, Asian and minority ethnic.