Basic models using outcome measures peak anti-HBs level for 1st and 2nd screen and anti-HBc status for 1st screen only

Key: GMTratio: Geometric mean peak anti-HBs titer relative to baseline by covariate (i.e. age group 0�C5, number of doses ��3, vaccine group 4, village Keneba, gender male). ln(measurement time): time between last vaccination and peak anti-HBs measurement in weeks. 95%CI: 95% Confidence intervals. OR: odds ratio.aThe decline of anti-HBs level with time since last vaccination (measurement time) is expressed as the decrease in peak anti-HBs level for a unit increase in log(measurement time) with corresponding P-value and 95%CI, adjusted for all covariates.bNotes on 2nd screen: Age >15 yrs grouped together; vaccine groups 3, and 6 excluded, groups 1 and 2 not present. For further details on sub-grouping and exclusion of subcategories see Table 1 and text. Anti-HBs level had a dose-dependent effect on risk of core-conversion; re-converters and variable positives (n = 61 and n = 7, respectively) were excluded from the analysis.