Table 1 Characteristics of the cases and controls the year before A/H1N1 2009 pandemic influenza

Male sex, n (%)

26 (59)

186 (50)

0.26

Age, years, mean (SD)

14.9 (11.0)

20.1 (13.2)

0.01

Mutation CFTR ∆F508/∆F508, n (%)

19 (43)

150 (40)

0.41

Bronchopulmonary bacterial colonization, n (%)

  S. aureus

34 (77)

234 (63)

0.063

  P. aeruginosa

15 (34)

195 (53)

0.021

FEV1, %, mean (SD)

79 (28)

65 (25)

0.005

FVC, %, mean (SD)

87 (23)

79 (21)

0.073

Cystic fibrosis-specific FEV1, percentiles, mean (SD)

52 (32)

51 (30)

0.78

Antibiotics, number of treatments, mean (SD)

 Oral

2.2 (1.9)

2.5 (1.9)

0.17

 Intravenous

0.8 (1.5)

1.1 (1.7)

0.20

Oxygen therapy, n (%)

2 (5)

3(4)

0.86

Noninvasive ventilation, n (%)

1 (2)

1(1)

0.69