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Table 3 HBsAg positivity by age when surveyed in 2007–08 (and hence by year of birth) among 4613 children born since nationwide vaccination began in 1990 in The Gambia

From: Efficacy and effectiveness of infant vaccination against chronic hepatitis B in the Gambia Hepatitis Intervention Study (1986–90) and in the nationwide immunisation program

Years of age in 2007–08 (and median birth year) HBsAg positivity/number tested (%)
1- 5 (2005) 3/1921 (0.2%)
5- 9 (2001) 6/1591 (0.4%)
10-14 (1996) 10/ 825 (1.2%)
15-17 (1993) 5/ 276 (1.8%)
1-17 (2002) 24/4613 (0.5%)
  1. p (trend) <0.0001.