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

BMC Pediatrics

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 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.

ISSN: 1471-2431