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Table 4 Frequency of acute otitis media (AOM) during follow-up.

From: Impact on respiratory tract infections of heptavalent pneumococcal conjugate vaccine administered at 3, 5 and 11 months of age

Episodes PCV-7 group (n = 811) Control group (n = 744) RR 95% CI P
Total number of AOM cases during follow-up 637 698    
Episodes/100 child-years 39.2 46.9 0.83 0.61–1.02 0.02
AOM in children aged 6–12 months 156 156    
Episodes/100 child-years 38.4 41.9 0.91 0.75–1.20 0.06
AOM in children aged 13–18 months 195 220    
Episodes/100 child-years 48.0 59,1 0.81 0.76–1.02 0.04
AOM in children aged 19–24 months 144 162    
Episodes/100 child-years 35.5 43.5 0.82 0.62–1.24 0.04
AOM in children aged 25–30 months 142 160    
Episodes/100 child-years 35.0 43.0 0.81 0.61–1.20 0.04
  1. RR = relative risk; 95% CI = 95% confidence interval.