Table 1 Characteristics of hospitalisations for ARI in 2006 and 2015

All-cause hospitalisations

402,270

389,067

381,091

370,553

ARI hospitalisations

6751

9641

11,744

11,896

Age

 < 75 y-o

44.4%

44.4%

40.5%

41.0%

 75–79 y-o

14.1%

12.4%

12.8%

11.3%

 80–84 y-o

16.2%

16.0%

16.0%

15.2%

 85–89 y-o

11.6%

16.2%

17.1%

16.5%

 ≥ 90 y-o

13.7%

11.0%

13.6%

16.0%

ARI ICU hospitalisations

740

1239

2135

2036

Age

 < 75 y-o

59.7%

61.3%

54.7%

58.2%

 75–79 y-o

14.5%

13.2%

15.0%

12.2%

 80–84 y-o

14.5%

12.7%

14.4%

13.2%

 85–89 y-o

8.3%

9.0%

11.0%

10.2%

 ≥ 90 y-o

3.0%

3.8%

4.9%

6.2%

Sex ratio (M/F)

 < 75 y-o

2.07

1.75

1.95

2.07

 75–79 y-o

1.97

1.81

1.70

2.06

 80–84 y-o

1.49

1.38

1.67

1.55

 85–89 y-o

0.88

0.90

1.04

1.03

 ≥ 90 y-o

1.20

0.96

1.0

0.51

SAPS II (mean ± SD)

Included age

 < 75 y-o

–

33.6 ± 17.0^a

34.0 ± 17.3

36.4 ± 17.4

 75–79 y-o

–

38.9 ± 13.3^a

40.0 ± 16.4

42.6 ± 15.7

 80–84 y-o

–

41.7 ± 13.8^a

42.3 ± 17.2

44.3 ± 17.9

 85–89 y-o

–

40.8 ± 13.2^a

41.5 ± 15.0

41.3 ± 14.0

 ≥ 90 y-o

–

39.3 ± 12.6^a

39.9 ± 13.2

40.0 ± 10.7

Excluded age

 < 75 y-o

–

24.4 ± 16.1^a

24.4 ± 16.5

26.4 ± 16.7

 75–79 y-o

–

22.9 ± 13.3^a

24.0 ± 16.4

26.6 ± 15.7

 80–84 y-o

–

23.7 ± 13.8^a

24.3 ± 17.2

26.3 ± 17.9

 85–89 y-o

–

22.8 ± 13.2^a

23.5 ± 15.0

23.3 ± 14.0

 ≥ 90 y-o

–

21.3 ± 12.6^a

21.9 ± 13.2

22.0 ± 10.7

Invasive MV (n, %)

 < 75 y-o

172 (38.9)

224 (29.5)

425 (36.4)

440 (37.1)

 75–79 y-o

43 (40.2)

51 (31.3)

77 (24.0)

75 (30.2)

 80–84 y-o

33 (30.8)

49 (31.2)

90 (29.3)

74 (27.6)

 85–89 y-o

18 (29.0)

18 (16.1)

34 (14.5)

31 (15.0)

 ≥ 90 y-o

0 (0)

2 (4.3)

12 (11.5)

8 (6.3)

Non-invasive MV (n, %)

 < 75 y-o

92 (20.8)

165 (21.7)

353 (30.2)

447 (37.7)

 75–79 y-o

25 (23.4)

51 (31.3)

100 (31.2)

95 (38.3)

 80–84 y-o

31 (29.0)

43 (27.4)

102 (33.2)

103 (38.4)

 85–89 y-o

19 (30.6)

22 (19.6)

78 (33.2)

56 (27.1)

 ≥ 90 y-o

1 (4.5)

3 (6.4)

24 (23.1)

40 (31.5)

Vasopressor (n, %)

 < 75 y-o

101 (22.9)

133 (17.5)

271 (23.2)

308 (26.0)

 75–79 y-o

37 (34.6)

29 (17.8)

57 (17.8)

55 (22.2)

 80–84 y-o

21 (19.6)

24 (15.3)

64 (20.8)

52 (19.4)

 85–89 y-o

11 (17.7)

11 (9.8)

23 (9.8)

24 (11.6)

 ≥ 90 y-o

2 (9.1)

1 (2.1)

12 (11.5)

7 (5.5)

LOS in ICU (day, mean ± SD)

 < 75 y-o

8.3 ± 13.0

7.5 ± 10.0

8.7 ± 12.7

10.6 ± 16.8

 75–79 y–o

11.8 ± 22.9

8.6 ± 13.5

8.3 ± 12.4

9.8 ± 15.1

 80–84 y-o

7.0 ± 10.5

8.6 ± 11.4

8.0 ± 10.1

8.2 ± 9.3

 85–89 y-o

5.2 ± 5.5

5.6 ± 5.1

5.9 ± 6.3

6.2 ± 6.7

 ≥ 90 y-o

3.7 ± 3.4

3.8 ± 3.3

5.1 ± 4.9

6.0 ± 6.7