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Table 5 Antibiotic courses prescribed 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 antibiotic courses during follow-up 2,020 2,076    
Courses/100 child-years 124 139 0.89 0.83–0.94 0.0001
Antibiotic courses in children aged 6–12 months 504 454    
Courses/100 child-years 122 120 1.01 0.89–1.14 0.87
Antibiotic courses in children aged 13–18 months 620 658    
Courses/100 child-years 153 177 0.86 0.76–0.95 0.004
Antibiotic courses in children aged 19–24 months 549 562    
Courses/100 child-years 135 151 0.89 0.79–1.01 0.06
Antibiotic courses in children aged 25–30 months 347 402    
Courses/100 child-years 85 108 0.78 0.67–0.90 0.0008
  1. RR = relative risk; 95% CI = 95% confidence interval.