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Table 2 PCV introduction and probability of being up-to-date at 13 months

From: Impact of the introduction of pneumococcal conjugate vaccine on immunization coverage among infants

  Contrast a: PCV adoption vs. predicted baseline Contrast b: PCV routine vs. predicted baseline
Group Odds ratio 95% CI Fitted probability Predicted probability Odds ratio 95% CI Fitted probability Predicted probability
Group A 1.0 0.5 – 1.8 0.95 0.95 0.8 0.4 – 1.4 0.94 0.95
Group B 0.5 0.2 – 1.2 0.96 0.98 0.7 0.3 – 1.5 0.97 0.98
Group C 0.5 0.4 – 0.8 0.92 0.95 0.5 0.3 – 0.8 0.93 0.96
Group D 1.2 0.5 – 2.9 0.90 0.89 2.0 0.6 – 7.0 0.94 0.88
  1. Contrast acompares a child's probability of being up-to-date at 13 months among the February 2000 birth cohort to that predicted from the pre-PCV baseline trend. Contrast bcompares a child's probability of being up-to-date at 13 months among the July 2000 birth cohort to that predicted from the pre-PCV baseline trend. For each contrast, the "fitted probability" was the probability of being up-to-date as fitted from the multivariate regression models based on the observed data and the "predicted probability" was extrapolated from the pre-PCV baseline trend.