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Table 4 Comparison of seroprevalence of HBsAg and anti-HBs in “the same school” and “the others” groups

From: Hepatitis B virus vaccination booster does not provide additional protection in adolescents: a cross-sectional school-based study

Item 18-year age group (birth cohort 1993–1994)
  The same school (n = 38) The others (n = 1256) P-value
Anti-HBs (+), n (%, 95% CI) 29 (76.3, 62.8-89.8) 499 (39.7, 37.0-42.4) <0.001*
Anti-HBs (−), n (%, 95% CI) 9 (23.7, 10.2-37.2) 757 (60.3, 57.6-63.0)
Anti-HBs titer, mean ± SD (median) 157.6 ± 281.3 (P50 = 24.7) 58.8 ± 145.9 (P50 = 4.2) <0.001*
HBsAg (+), n (%) 0 (0.0) 10 (0.8%) 0.581
HBsAg (−), n (%) 38 (100.0) 1246 (99.2%)  
  1. Data are presented as n and percentage or mean ± standard deviation (median).
  2. *p-value < 0.05 was considered statistically significant after test.