Table 2a.

Prevalence of SARS-CoV-2 seropositivity by participant characteristics, both hospitals, April 2021.

Participant characteristics		Total	SARS-CoV-2 seropositive participants
		N	n	% (95% CI)	p-value*
All participants		5,085	898	18 (17–19)
Hospital	Hospital 1	2,945	623	21 (20–23)	<0.001
	Hospital 2	2,140	275	13 (11–14)
Age groups (years)	18–29	1,108	249	22 (20–25)	<0.001
	30–39	1,330	238	18 (16–20)
	40–49	1,414	208	15 (13–17)
	50–59	951	158	17 (14–19)
	Over 60	282	45	16 (12–21)
Sex	Female	3,959	669	17 (16–18)	0.008
	Male	1,126	229	20 (18–23)
Ethnicity	Irish (White)	3,798	595	16 (15–17)	<0.001
	Any other white background	476	94	20 (16–24)
	Asian background	599	148	25 (21–28)
	African or any other black background	117	39	33 (25–43)
	Other	95	22	23 (15–33)
Country of birth	Ireland	3,630	567	16 (14–17)	<0.001
	United Kingdom	295	44	15 (11–20)
	India	293	76	26 (21–31)
	Philippines	214	54	25 (20–32)
	Poland	85	20	24 (15–34)
	USA	55	11	20 (10–33)
	Romania	45	15	33 (20–49)
	Nigeria	35	19	54 (31–71)
	Other	433	92	21 (17–25)
Education	Primary	22	7	32 (14–55)	<0.001
	Secondary	609	133	22 (19–25)
	Third level	2,244	434	19 (18–21)
	Post-graduate	2,210	324	15 (13–16)
Role	Admin	676	85	13 (10–15)	<0.001
	Medical/dental	713	116	16 (14–19)
	Nursing/ midwifery	1,891	395	21 (19–23)
	Allied health	1,044	118	11 (9.4–13)
	General support	365	81	22 (18–27)
	Health care assistant	291	93	32 (27–38)
	Other	105	10	10 (4.7–17)
Lives with	Alone	464	61	13 (10–17)	0.008
	With others	4,610	834	18 (17–19)
	Missing	11	3	27 (6.0–61)
Lives with HCW	Yes	1,571	340	22 (20–24)	<0.001
	No	3,412	540	16 (16–17)
	Missing	102	18	18 (11–26)

^*Calculated using the chi-square test. Statistically significant findings in bold.