Table 1.

Prevalence of antibodies against the hepatitis B surface antigen (anti-HBs).

Variable	n	Prevalence (95% CI)	OR (95% CI)	p	aOR (95% CI)	p
Age (in years)
<25	30	86.7 (69.3–96.2)	4.25 (1.42–12.73)	0.010	3.40 (1.06–10.90)	0.040
25 – 34	186	68.8 (61.6–75.4)	1.44 (0.93–2.24)	0.102	1.41 (0.87–2.27)	0.162
35 – 44	167	60.5 (52.6–67.9)	Reference		Reference
45 – 54	170	61.2 (53.4–68.5)	1.03 (0.67–1.60)	0.896	0.94 (0.58–1.51)	0.790
≥55	91	61.5 (50.8–71.6)	1.05 (0.62–1.77)	0.868	0.89 (0.51–1.57)	0.692
Sex
Male	151	57.6 (49.3–65.6)	Reference		Reference
Female	493	66.5 (62.2–70.7)	1.46 (1.01–2.12)	0.046	1.52 (0.99–2.33)	0.054
Professional category
Physicians	191	69.1 (62–75.6)	3.90 (2.40–6.34)	<0.001	4.15 (2.49–6.90)	<0.001
Nurses	249	77.1 (71.4–82.2)	5.88 (3.65–9.47)	<0.001	5.84 (3.56–9.58)	<0.001
Other clinical workers	86	55.8 (44.7–66.5)	2.20 (1.25–3.89)	0.006	1.95 (1.08–3.52)	0.027
Non-clinical workers	118	36.4 (27.8–45.8)	Reference		Reference
Type of centre
Primary healthcare	299	56.2 (50.4–61.9)	Reference		Reference
Hospital	345	71.6 (66.5–76.3)	1.97 (1.42–2.73)	<0.001	1.83 (1.28–2.62)	0.001
All	644	64.4 (60.6–68.1)