Table I.

HBV serological patterns by age in Italian and non-Italian HBsAg-negative subjects (2007–2008).

Age classes (years)	N		Anti-HBs+/anti-HBc+ (95% CI)			Anti-HBs+/anti-HBc– (95% CI)			Anti-HBs/anti-HBc+ (95% CI)
	Italians	Non-Italians	Italians	Non-Italians	p	Italians	Non-Italians	p	Italians	Non-Italians	p
≤30	950	75	9 (0.9%) (0.30–1.50)	5 (6.7%) (1.04–12.36)	<0.01	773 (81.4%) (78.93–83.87)	23 (30.7) (20.26–41.14)	<0.01	1 (0.1%) (0.00–0.30)	2 (2.7%) (0.00–6.37)	<0.05
31–50	1,690	153	93 (5.5%) (4.41–6.59)	42 (27.5%) (20.42–34.57)	<0.01	321 (19.0%) (17.13–20.87)	22 (14.4%) (8.84–19.96)	NS	45 (2.7%) (1.93–3.47)	17 (11.1%) (6.12–16.08)	<0.01
>50	1,971	34	417 (21.2%) (19.39–23.00)	12 (35.3%) (19.24–51.36)	NS	96 (4.9%) (3.95–5.85)	0 (0%) (0.00–0.00)	NS	272 (13.8%) (12.28–15.32)	7 (20.6%) (7.01–34.19)	NS
Total	4,611	262	519 (11.3%) (10.39–12.21)	59 (22.5%) (17.44–27.56)	<0.01	1,190 (25.8%) (24.54–27.06)	45 (17.2%) (12.63–21.77)	<0.01	318 (6.9%) (6.17–7.63)	26 (9.9%) (6.28–13.52)	NS

NS=not significant