Table 3.

Prevalence of SARS-CoV-2 antibodies by participant characteristics, both hospitals

Participant characteristics	Total	SARS-CoV-2 antibody detected		P valuea
	N	n	% (95% CI)
Age groups (years)
18–29	1350	177	13 (11–15)	<0.001
30–39	1617	168	10 (8.9–12)
40–49	1515	124	8.2 (6.9–9.7)
50–59	1001	77	7.7 (6.1–9.5)
Over 60	304	30	9.9 (6.8–14)
Sex
Female	4478	422	9.4 (8.6–10)	0.013
Male	1308	154	12 (10–14)
Ethnicity
Irish	4444	384	8.6 (7.8–9.5)	<0.001
Any other white background	551	62	11 (8.7–14.2)
African and any other black background	113	16	14 (8.3–22)
Asian background	577	107	19 (16–22)
Other	101	7	6.9 (2.6–15)
Country of birtha
Ireland	4273	373	8.7 (7.9–9.6)	<0.001
UK	344	32	9.3 (6.5–13)
India	299	54	18 (14–31)
Philippines	191	47	25 (19–31)
Poland	72	10	14 (6.9–24)
USA	60	3	5.0 (1.0–14)
Other	548	57	10 (8.0–13)
Education
Primary	29	4	14 (3.9–32)	0.055
Secondary	684	61	8.9 (6.9–11)
Third level	2545	283	11 (9.9–12)
Post-graduate	2527	228	9.0 (7.9–10)
Role
Admin	803	48	6.0 (4.4–7.9)	<0.001
Medical/dental	982	102	10 (8.6–13)
Nursing/midwifery	2064	263	13 (11−14)
Allied health	1091	73	6.7 (5.3–8.3)
General support	434	33	7.6 (5.3–11)
Health care assistant	286	50	18 (13–22)
Other	127	7	5.5 (2.2–11)
Lives with
Alone	479	28	5.9 (3.9–8.3)	0.007
With others	5286	546	10 (9.5–11)
Missing	22	2	9.1 (1.1–29)
Lives with HCW
Yes	1767	234	13 (12–15)	<0.001
No	3919	332	8.5 (7.6–9.4)
Missing	101	10	9.9 (4.9–18)

^aCalculated using the χ² test.