Table 4

Univariable and multivariable regression ORs, hepatitis B surface antibody (anti-HBs) positivity by patient characteristics (also adjusted for clinic)

Characteristic	Number tested	Univariable OR anti-HBs	95% CI	P²	Multivariable OR anti-HBs	95% CI	P²
Total	2551
Age group
18–25	515	Ref		<0.001			<0.001
26–35	970	2.48	1.95 to 3.15		2.32	1.81 to 2.97
36–45	596	3.11	2.35 to 4.12		2.91	2.17 to 3.90
46 and over	470	2.15	1.62 to 2.85		2.05	1.52 to 2.76
HIV status
Negative	2202	Ref		<0.001			0.170
Positive	349	1.77	1.30 to 2.42	<0.001	1.26	0.90 to 1.77	0.170
History of STI in past year
No	1867	Ref		<0.001			<0.001
Yes	684	1.80	1.43 to 2.26	<0.001	1.61	1.27 to 2.05	<0.001
Country of birth					Not included
UK	1348	Ref		<0.001
Non-UK	1112	1.65	1.36 to 2.01
Unknown	91	1.30	0.78 to 2.17
Region of birth
UK	1348	Ref		<0.001			0.020
Africa	77	1.81	0.98 to 3.32		1.43	0.77 to 2.65
Americas	226	1.48	1.04 to 2.09		1.14	0.79 to 1.64
Eastern Mediterranean	71	1.17	0.67 to 2.04		0.97	0.54 to 1.72
Europe	560	1.67	1.31 to 2.14		1.40	1.08 to 1.81
South-East Asia	47	1.55	0.74 to 3.24		1.28	0.61 to 2.73
Western Pacific	130	2.44	1.45 to 4.12		2.40	1.41 to 4.11
Unknown	92	1.32	0.79 to 2.20		1.05	0.61 to 1.80

STI, sexually transmitted infection.