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Seroprevalence of anti-HBs lower than 10 IU/L and titer according to vaccination before and after the first year of age with a time between vaccine and analysis of antibodies between 16 and 25 years.
| Time All ≥ 16 Years | n | <10 IU/L | % | χ2 | p | Titer IU/L Mean ± SD | p |
|---|---|---|---|---|---|---|---|
| vaccinated before 1 year | 6013 | 3017 | 50.2 | 165.235 | <0.0001 | 50.1 ± 127.9 | <0.0001 |
| vaccinated after 1 year | 383 | 62 | 16.2 | 222.0 ± 314.7 |
