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

BMC Pediatrics

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

	*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

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.

ISSN: 1471-2431