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Table 3 PCV introduction and probability of never being underimmunized by 13 months of age

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

  Contrast a: PCV adoption vs. pre-PCV baseline Contrast b: PCV routine vs. pre-PCV baseline
Group Odds ratio 95% CI Fitted probability Predicted probability Odds ratio 95% CI Fitted probability Predicted probability
Group A 1.1 0.7 – 1.6 0.83 0.82 1.1. 0.7 – 1.8 0.86 0.85
Group B 0.4 0.3 – 0.5 0.55 0.77 0.4 0.3 – 0.6 0.65 0.81
Group C 0.33 0.26 – 0.42 0.34 0.60 0.5 0.4 – 0.7 0.58 0.72
  1. Contrast acompares a child's probability of spending zero days underimmunized by 13 months among the February 2000 birth cohort based on the observed data to that predicted from the pre-PCV baseline trend. Contrast bcompares a child's probability of spending zero days underimmunized by 13 months among the July 2000 birth cohort based on the observed data to that predicted from the pre-PCV baseline trend. For each contrast, the "fitted probability" was the probability of spending no time underimmunized as fitted from the multivariate regression models and the "predicted probability" was extrapolated from the pre-PCV baseline trend.