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Table 3 Frequency of radiologically confirmed community-acquired pneumonia (CAP) 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 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

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