Table 2 Frequency of respiratory tract infections (RTIs) during follow-up.
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 | Â | Â | Â |
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 |