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Table 2 Frequency of respiratory tract infections (RTIs) 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 RTIs during follow-up 3,877 3,460    
Episodes/100 child-years 239.0 232.5 1.02 0.98–1.07 0.32
RTIs in children aged 6–12 months 1,035 928    
Episodes/100 child-years 255.2 249.4 1.02 0.94–1.12 0.62
RTIs in children aged 13–18 months 1,185 986    
Episodes/100 child-years 292.2 265.0 1.10 1.00–1.18 0.055
RTIs in children aged 19–24 months 998 872    
Episodes/100 child-years 246.1 234.4 1.05 0.96–1.15 0.31
RTIs in children aged 25–30 months 659 674    
Episodes/100 child-years 162.5 181.1 0.90 0.81–1.00 0.047
  1. RR = relative risk; 95% CI = 95% confidence interval.