Table 3

Frequency of radiologically confirmed community-acquired pneumonia (CAP) during follow-up.

Episodes
PCV-7 group (n = 811)
Control group (n = 744)
RR
95% CI
P

Total number of CAP cases during follow-up
27
72



Episodes/100 child-years
1.7
4.8
0.35
0.22–0.53
<0.0001
CAP in children aged 6–12 months
9
7



Episodes/100 child-years
2.2
1.88
1.17
0.44–3.16
0.74
CAP in children aged 13–18 months
3
9



Episodes/100 child-years
0.7
2.4
0.30
0.08–1.11
0.07
CAP in children aged 19–24 months
7
16



Episodes/100 child-years
1.72
4.30
0.40
0.16–0.97
0.04
CAP in children aged 25–30 months
8
40



Episodes/100 child-years
1.97
10.7
0.18
0.09–0.39
<0.0001

RR = relative risk; 95% CI = 95% confidence interval.

Esposito et al. Respiratory Research 2007 8:12   doi:10.1186/1465-9921-8-12