Figure 2

PCV introduction and immunization coverage: illustration of primary contrasts. Graph uses data from Group C as an example. ---: coverage based on multivariate regression models and the observed data. - - - -: coverage predicted from the pre-PCV baseline trend. Time point a: February 2000 birth cohort, start of the PCV adoption period. Contrast acompares immunization coverage for the February 2000 birth cohort based on the observed data to that predicted from the pre-PCV baseline trend. Time point b: July 2000 birth cohort, start of the PCV routine period. Contrast bcompares immunization coverage for the July 2000 birth cohort based on the observed data to that predicted from the pre-PCV baseline trend.