Table 1 Summary of patient demographics, admission details and primary diagnoses by age strata

Age (years)

61.7 (17.5)

29.4 (6.5)

54.4 (7.0)

72.7 (4.2)

84.2 (3.5)

<0.0001

Male sex

59.5

57.0

61.5

61.4

51.1

<0.0001

Hospital admission source

   Home

79.2

74.4

79.0

81.0

79.8

<0.001

   Other acute care hospital

17.2

22.3

18.3

16.3

15.6

   Chronic care facility

1.3

0.6

0.8

1.2

3.3

   Other intensive care unit

1.8

2.6

1.9

1.6

1.3

Co-morbid disease

   Any

28.6

11.0

28.3

34.1

32.1

<0.001

   ≥ 2

6.5

2.5

6.3

7.8

7.3

<0.001

Specific co-morbid diseases

   Cardiovascular

15.6

2.3

12.0

21.1

23.5

<0.001

   Respiratory

8.4

3.2

7.6

10.7

9.5

<0.001

   Immunocompromised

4.9

3.8

6.1

4.8

3.2

<0.001

   Metastatic cancer

2.9

1.0

3.5

3.3

2.3

<0.001

   Hepatic

2.3

2.3

4.1

1.2

0.5

<0.001

   End-stage kidney disease

3.4

1.5

3.1

4.0

4.1

<0.001

   Haematologic malignancy

1.7

1.3

2.1

1.7

1.1

<0.001

Admission details

   Nonelective admission

61.0

83.4

60.5

53.0

61.8

<0.001

   Surgical admission

49.7

29.8

48.6

56.8

53.0

<0.001

Cardiovascular

46.1

13.5

44.5

55.6

39.5

<0.001

Trauma

7.9

24.9

6.7

3.4

5.6

<0.001

   Emergency surgical

31.3

62.5

28.6

25.3

38.1

<0.001

Primary diagnosis

   Sepsis/septic shock

27.8

28.7

28.4

27.0

27.5

<0.001

   Respiratory

11.7

12.0

12.5

11.4

10.0

<0.001

   Neurologic

9.3

13.3

12.2

6.6

5.1

<0.001

   Cardiac

9.3

4.7

8.6

10.5

12.3

<0.001

   Gastrointestinal (other)

8.8

2.5

7.2

10.4

15.0

<0.001

   Hepatic

5.9

4.0

6.5

5.5

7.4

<0.001

   Metabolic/poisoning

5.3

16.8

5.9

1.7

1.7

<0.001

   Gastrointestinal bleeding

2.3

1.3

2.3

2.2

4.0

<0.001