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Table 4 In-hospital mortality for pneumonia patients by hospital case volume level, after stratification by A-DROP score calculated from the Pneumonia Severity Indices at admission, Japanese DPC database, 2010

From: Association between hospital case volume and mortality in non-elderly pneumonia patients stratified by severity: a retrospective cohort study

A-DROPScore

  

Hospital case volume level

 
 

Total*

Very low (≤7)

Low (8–11)

Medium (12–17)

High (≥18)

p

0

N

4906

1027

1193

1283

1403

0.31

Deaths

29

9

6

7

7

%

0.6

0.9

0.5

0.6

0.5

1

N

1981

421

487

524

549

0.72

Deaths

61

6

22

20

13

%

3.1

1.4

4.5

3.8

2.4

2

N

701

158

184

176

183

0.01

Deaths

58

18

20

12

8

%

8.3

11.4

10.9

6.8

4.4

3

N

220

48

43

61

68

0.76

Deaths

52

14

7

15

16

%

23.6

29.2

16.3

24.6

23.5

4

N

120

34

34

28

24

0.36

Deaths

53

14

14

12

13

%

44.2

41.2

41.2

42.9

54.2

  1. p-value from Mantel-Haenszel chi-squared test for trend.
  2. *365 patients had missing value in at least one of the severity markers and were excluded from the table.