The long-term immunogenicity of recombinant hepatitis B virus (HBV) vaccine: contribution of universal HBV vaccination in Italy

Table 1 Demographics of the vaccinated, HBsAg-negative students enrolled

Characteristic		Value
N° of subjects		1,704
Age, years		26 ± 4.7
Females		1,033 (60.6)
Years since vaccination		17.7 ± 3.9
Place of birth:	Italy	1,685 (98.9)
Place of birth:	Elsewhere	19 (1.1)
Attending:	School of medicine	525 (30.8)
	Healthcare profession school	829 (48.6)
	Postgraduate medical school	350 (20.6)
Vaccination conducted:	in infancy	588 (34.6)
Vaccination conducted:	at 12 years old	1116 (65.4)
Year of vaccination:	pre-1992	188 (11.0)
	1992–1993	445 (26.1)
	1994–1995	156 (9.2)
	1996–1997	176 (10.3)
	1998–1999	236 (13.8)
	2000–2001	304 (17.8)
	2002	199 (11.7)
HBsAb titer:	<10 IU/L	270 (15.8)
	10–400 IU/L	987 (57.9)
	10–400 IU/L	447 (26.3)
	>400 IU/L	447 (26.3)

Continuous variables are given as mean ± SD; categorical variables are given as n° (%).

ISSN: 1471-2334