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Table 3 Characteristics of students stratified by anti-HBs titer

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

  <10 IU/L ≥10 IU/L P
N° of students 270 1,434  
Age, years 24 ± 5.18 26 ± 4.86 0.000
Females 158 (58.5) 875 (60) n.s
Attending: School of medicine 66 (24.4) 459 (32) 0.0001*
Healthcare profession school 159 (59) 670 (47)
Postgraduate medical school 45 (16.6) 305 (21)
Vaccinated in infancy 135 (50) 452 (31.0) 0.000
at 12 years old 135 (50) 982 (67.0)
Year of vaccination pre-1992 36 (13.0) 153 (11.0) n.s
1992–1993 92 (34.0) 352 (24.4)
1994–1995 20 (7.0) 136 (9.6)
1996–1997 25 (10.0) 151 (10.5)
1998–1999 26 (10.0) 210 (14.5)
2000–2001 37 (14.0) 267 (18.5)
2002 34 (12.0) 165 (11.5)
Years from vaccination 18.29 ± 3.97 17.57 ± 3.85 0.005
  1. *Healthcare profession school students vs. all medical school students (graduate + postgraduate). Continuous variables are given as mean ± SD; categorical variables are given as n° (%).