Table 2

ORs for total, indirect and direct effects

	Total*			Indirect*			Direct*
	OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value
Other professional and associate	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref
Administrative and secretarial	1.29	0.89 to 1.85	0.18	1.04	1.01 to 1.08	0.01	1.23	0.85 to 1.78	0.27
Healthcare	2.46	1.82 to 3.33	<0.001	1.23	1.09 to 1.40	0.001	2.00	1.43 to 2.79	<0.001
Indoor trades, process and plant	2.07	1.38 to 3.12	<0.001	1.17	1.06 to 1.30	0.003	1.77	1.16 to 2.69	0.01
Leisure and personal service	1.80	1.03 to 3.14	0.04	1.14	1.04 to 1.25	0.01	1.58	0.92 to 2.74	0.10
Managers, directors and senior officials	1.17	0.78 to 1.77	0.45	1.04	1.003 to 1.08	0.03	1.13	0.75 to 1.69	0.56
Outdoor trades	1.61	0.83 to 3.10	0.16	1.13	1.04 to 1.23	0.005	1.42	0.74 to 2.75	0.29
Sales and customer service	1.53	0.87 to 2.67	0.14	1.11	1.04 to 1.18	0.002	1.38	0.78 to 2.45	0.27
Social care and community protective services	1.41	0.86 to 2.32	0.18	1.12	1.04 to 1.21	0.005	1.26	0.75 to 2.12	0.38
Teaching, education and childcare	1.17	0.85 to 1.61	0.33	1.12	1.04 to 1.21	0.002	1.04	0.75 to 1.46	0.80
Transport and mobile machine	2.17	1.04 to 4.50	0.04	1.23	1.08 to 1.40	0.002	1.77	0.87 to 3.61	0.12

*Total effect=the effect of occupation prior to adjustment for the mediator (work-related close contact); indirect effect=the effect of occupation on odds of seropositivity mediated through work-related close contact; direct effect=the effect of occupation excluding mediation by work-related close contact.