Table 3 

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

Contrast a: PCV adoption vs. prePCV baseline 
Contrast b: PCV routine vs. prePCV 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 


Contrast a compares 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 prePCV baseline trend. Contrast b compares 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 prePCV 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 prePCV baseline trend. 

Lin et al. BMC Pediatrics 2005 5:43 doi:10.1186/14712431543 