Table 1 Patients characteristics in development dataset (n = 939,409) and validation dataset (n = 939358)

Major Diagnostic Category

Digestive system

194,257

20.7

193,857

20.6

Respiratory System

100,591

10.7

101,001

10.8

Blood and Blood Forming Organs and Immunological Disorders

22,741

2.4

23,009

2.4

Kidney

73,240

7.8

73,353

7.8

Nervous System

65,096

6.9

64,619

6.9

Circulatory System

91,892

9.8

92,188

9.8

Female, Breast

82,732

8.8

82,696

8.8

Endocrine

31,528

3.4

31,488

3.4

Skin, Ear, Eye, Pediatric and Newborn

139,642

14.7

139,614

14.9

Musculoskeletal, injuries and others

137,690

14.7

137,533

14.6

Sex

Male

497,564

53.0

307,974

32.8

Age (years)

under50

306,473

32.6

134,255

14.3

50-59

134,905

14.4

185,643

19.8

60-69

186,102

19.8

207,560

22.1

70-79

208,171

22.2

89,130

9.5

80-89

88,922

9.5

14,796

1.6

90 and over

14,836

1.6

307,974

32.8

Total score of Charlson Index

score0

652,986

69.5

651,578

69.4

score1,2

209,063

22.3

209,543

22.3

score3-6

53,781

5.7

53,974

5.7

score7-12

17,645

1.9

18,202

1.9

score13-

5,934

0.6

6,061

0.6

Admission Status

Status emergency

397,650

42.3

397,802

42.3

Use of an ambulance

116,987

12.5

116,988

12.5

Hospitalization for examination

62,673

6.7

63,012

6.7

Planned short-term admission

44,434

4.7

44,494

4.7

Performance Status

grade0, grade1, or missing

921,721

98.1

921,533

98.1

grade2

7,544

0.8

7,724

0.8

grade3

5,103

0.5

5,103

0.5

grade4

5,041

0.5

4,998

0.5

Fletcher Hugh-Jones Classification

class1, class2, or missing

912,266

97.1

911,891

97.1

class3, class4

16,082

1.7

16,306

1.7

class5

110,61

1.2

11,161

1.2

In-hospital

Mortality

34,636

3.7

34,866

3.7

C-index

0.882

0.882