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 a compares 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 b compares immunization coverage for the July 2000 birth cohort based on the observed data to that predicted from the pre-PCV baseline trend.

Lin et al. BMC Pediatrics 2005 5:43   doi:10.1186/1471-2431-5-43
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