The Scientific World Journal

Research Article

Impact of Pneumococcal Conjugate Vaccine on Pediatric Tympanostomy Tube Insertion in Partial Immunized Population

Table 3

Estimated rate ratios and 95% confidence intervals for the effect of birth cohort on tympanostomy tube insertion rate per population of 100,000.
　RR95% CI
2002-2003 cohort1.00  
2004-2005 cohort0.90 0.83–0.97
2006-2007 cohort0.21 0.19–0.23
RR: rate ratios.
CI: confidence interval.