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Table 3 Characteristics of hospitals (n = 468*)

From: Assessment of hospital performance with a case-mix standardized mortality model using an existing administrative database in Japan

  

All

Hospitals

c-index

->0.8

c-index

< 0.8

P value

   

N = 468

 

N = 446

 

N = 22

 
  

Mean

SD

Mean

SD

Mean

SD

 

C-index

 

0.88

0.04

0.88

0.03

0.77

0.03

<0.001

Number of admission

 

4011.5

2539.4

4128.9

2528.6

1631.7

1297.3

<0.001

Hospital mortality rate

 

4.0%

1.5%

4.0%

1.4%

5.0%

2.9%

0.001

Average predicted risk

 

4.0%

1.3%

4.0%

1.3%

4.4%

1.9%

0.251

Standardized mortality rate

 

3.8%

1.3%

3.7%

1.1%

4.7%

3.4%

0.001

Major Diagnostic Category

Digestive system

21.2%

8.5%

21.6%

8.2%

14.7%

11.7%

<0.001

 

Respiratory System

11.0%

4.5%

11.1%

4.4%

9.5%

6.7%

0.106

 

Blood and Blood Forming Organs and Immunological Disorders

2.0%

1.6%

2.1%

1.6%

1.1%

1.2%

0.007

 

Kidney

7.9%

5.5%

7.8%

4.8%

8.9%

13.4%

0.351

 

Nervous System

7.8%

8.4%

7.2%

6.6%

20.1%

22.2%

<0.001

 

Circulatory System

10.0%

9.2%

9.8%

8.3%

14.1%

20.2%

0.033

 

Female, Breast

7.5%

5.9%

7.7%

5.8%

2.4%

6.4%

<0.001

 

Endocrine

3.3%

1.7%

3.4%

1.7%

2.9%

2.0%

0.224

 

Skin, Ear, Eye, Pediatric and Newborn

13.6%

5.9%

13.9%

5.8%

6.9%

5.0%

<0.001

 

Musculoskeletal, injuries and others

15.6%

8.7%

15.5%

8.3%

19.2%

15.4%

0.052

Sex

Male

52.8%

4.8%

52.8%

4.7%

54.6%

6.8%

0.072

Age (years)

under50

30.4%

9.9%

30.9%

9.6%

19.5%

9.5%

<0.001

 

50-59

13.8%

2.8%

13.8%

2.7%

13.9%

3.7%

0.878

 

60-69

19.4%

3.6%

19.4%

3.5%

20.1%

5.1%

0.346

 

70-79

23.0%

4.3%

22.8%

4.2%

27.0%

4.4%

<0.001

 

80-89

11.3%

4.6%

11.0%

4.3%

16.2%

7.1%

<0.001

 

90-

2.1%

1.6%

2.1%

1.5%

3.4%

2.5%

<0.001

Admission Status

Status emergency

47.0%

15.6%

46.7%

15.2%

51.6%

22.0%

0.155

 

Use of an ambulance

13.6%

7.3%

13.4%

6.8%

19.3%

12.6%

<0.001

 

Hospitalization for examination

4.0%

5.8%

4.1%

5.9%

3.0%

5.2%

0.374

 

Planned short-term admission

6.8%

5.9%

6.6%

4.7%

11.0%

16.9%

0.001

  

N

%

N

%

N

%

P value

Public hospital**

 

130

27.8

128

28.7%

2

9.1%

0.025

University hospital**

 

77

16.5%

76

17.0%

1

4.5%

0.079

Special hospital**

 

25

5.3%

18

4.0%

7

31.8%

<0.001

Have convalescent wards**

 

43

10.0%

38

9.3%

5

26.3%

0.025

  1. *One hospital (mortality rate = 0%) was excluded from this analysis
  2. **percentage of total hospitals