Table 1 Patient backgrounds on admission

Age (years) †

<0.001

  40–64

426

(2.6)

7,318

(10.3)

  65–74

1,851

(11.3)

16,562

(23.3)

  75–84

6,935

(42.3)

30,759

(43.4)

  ≥85

7,176

(43.8)

16,303

(23.0)

Sex

<0.001

  Male

13,328

(81.3)

58,815

(82.9)

  Female

3060

(18.7)

12,127

(17.1)

Body mass index (kg/m²)†

<0.001

  <18.5

7,196

(54.9)

23,835

(39.0)

  18.5–24.9

5,338

(40.7)

31,964

(52.3)

  25.0–29.9

512

(3.9)

4,684

(7.7)

  >30

58

(0.4)

631

(1.0)

Dyspnea scale

<0.001

  I

562

(3.8)

6159

(9.4)

  II

966

(6.5)

8,991

(13.7)

  III

1,239

(8.4)

9,001

(13.7)

  IV

2,509

(16.9)

16,277

(24.8)

  V

4,284

(28.9)

16,885

(25.7)

  Unspecified

5,273

(35.5)

8,348

(12.7)

Level of consciousness

<0.001

  Alert

10,233

(62.5)

60,993

(86.0)

  Dull

4,048

(24.7)

7,220

(10.2)

  Somnolence

1,379

(8.4)

1,610

(2.3)

  Coma

724

(4.4)

1,116

(1.6)

ADL level

<0.001

  20

1,633

(11.2)

23,281

(37.8)

  15–19

1,124

(7.7)

8,462

(13.7)

  10–14

1,614

(11.1)

9,887

(16.0)

  5–9

1,590

(10.9)

6,113

(9.9)

  0–4

8,598

(59.1)

13,927

(22.6)

A-DROP score ‡

<0.001

  Mild

175

(1.9)

4,293

(8.8)

  Moderate

4,833

(53.7)

31,067

(63.6)

  Severe

2,352

(26.1)

9,630

(19.7)

  Extremely severe

1,641

(18.2)

3,868

(7.9)