Figure 1

Calculation of predicted absolute differences in percent of 24-month-olds underimmunized for the hepatitis B vaccine series, birth dose suspension and reversal periods versus baseline. --- : % children underimmunized based on logistic regression model and the observed data. - - - - : % children underimmunized predicted from the baseline. Time point a: July 1999 birth cohort, start of the birth dose suspension period. Δ ₁ compares % children underimmunized for the July 1999 birth cohort based on the fitted data to that predicted from the baseline. Time point b: October 1999 birth cohort, following reversal of the birth dose suspension. Δ ₂ compares % children underimmunized for the hepatitis B vaccine series for the October 1999 birth cohort based on the fitted data to that predicted from baseline.