Table 2 Characteristics of the 1,704 vaccinated students stratified by age at vaccination
| Â | Vaccinated in infancy | Vaccinated at 12 years old | p | |
|---|---|---|---|---|
N° of students | 588 | 1,116 |  | |
Age, years | 21.5 ± 0.9 | 27.9 ± 4.4 | 0.000 | |
Females | 421 (72) | 613 (55) | 0.000 | |
Place of birth: | Italy | 584 (99.5) | 1101 (99) | n.s. |
Elsewhere | 4 (0.5) | 15 (1) | Â | |
Attending: | School of medicine | 33 (6) | 492 (44) | 0.000* |
Healthcare profession school | 555 (94) | 274 (24.7) | ||
Postgraduate medical school | 0 | 350 (31.3) | ||
Years from vaccination | 21.5 ± 0.9 | 15.6 ± 3.2 | 0.000 | |
Students with HBsAb < 10 IU/L | 135 (23) | 135 (12.1) | 0.000 | |
Students with HBsAb 10–400 IU/L | 396 (67.3) | 591 (53) | 0.000 | |
Genometric mean, IU/L | 30.4 | 59.6 | 0.000** | |
Students with HBsAb >400 IU/L | 57 (9.7) | 390 (34.9) | 0.000 | |
Students with HBsAb <10 IU/L: | Female | 91/421 (21.6) | 67/613 (11) | n.s. |
Male | 44/167 (26.5) | 68/503 (13.5) | Â | |
Vaccinated 1991–1995 | 135/588 (23) | 13/202 (6.4) | 0.000 | |
Vaccinated 1996–2002 | - | 122/914 (13.3) | - | |