Table 3

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

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


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 pre-PCV 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 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.

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

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