Table 1 Demographics and risk factors

Age (years)

65–102

60–98

–

Age median (years)

89

78

–

Female

63 (69 %)

51 (74 %)

–

Male

28 (31 %)

18 (26 %)

–

Hospital stay^a

15 (16.5 %)

3 (4.3 %)

0,016

Surgery^a

2 (2.2 %)

2 (2.9 %)

1

Foreign travel^a

1 (1.1 %)

23 (33.3 %)

<0,001

Hospital stay abroad^a

0

0

–

Chronic heart disease

31 (34.1 %)

11 (15.9 %)

0,01

COPD

10 (11.0 %)

1 (1.4 %)

0,024

Other chronic lung disease

5 (5.5 %)

4 (5.8 %)

1.00

Neurological disease, stroke

23 (25.3 %)

6 (8.7 %)

0.007

Diabetes mellitus

7 (7.7 %)

10 (14.5 %)

0.167

Autoimmune disease

8 (8.8 %)

3 (4.3 %)

0.353

Cancer

10 (11.0 %)

2 (2.9 %)

0.054

Haematological disease

1 (1.1 %)

0

1.00

Liver failure

1 (1.1 %)

0

1.00

Kidney failure

3 (3.3 %)

0

0.26

Immunosuppressive treatment^b

0

0

–

Antibiotic treatment^a

25 (27.5 %)

5 (7.2 %)

0.001