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Geometric mean anti-PRP antibody avidity indexes (M ammonium thiocyanate) together with 95% confidence intervals (error bars) by year of serum collection, for children aged 3 to 5 years and immunized on a primary schedule at 2, 3, and 4 months, from sera collected in studies conducted between 1994 and 2002. Studies are identified by year of serum collection and group letter (see Table 1).
