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Table 2 Model fit and discrimination by type of unit, main reason for PICU/CICU admission, year and age class

From: Performance of the pediatric index of mortality 2 (PIM-2) in cardiac and mixed intensive care units in a tertiary children’s referral hospital in Italy

 

Observed mortality

Expected mortality

SMR

ROC curve

(PIM-2 standardized)

N

%

95% CI

N

%

95% CI

SMR

95% CI

AUC

95% CI

Unit

CICU

54

4.0

(3.0 - 5.2)

88.8

6.6

(5.3 - 8.0)

0.6

(0.5 - 0.8) §

0.72

(0.65 - 0.80)

PICU1

29

5.4

(3.6 - 7.6)

49.1

9.1

(6.8 - 11.9)

0.6

(0.4 - 0.9) #

0.76

(0.66 - 0.85)

PICU2

38

5.5

(3.9 - 7.4)

35.6

5.5

(3.6 - 7.1)

1.1

(0.8 - 1.5)

0.85

(0.78 - 0.92)

PICU3

8

2.5

(1.1 - 4.9)

13.0

4.0

(2.2 - 6.8)

0.6

(0.3 - 1.2)

0.91

(0.80 - 1.00)

Main reason for PICU/CICU admission

Cardiac surgical

37

3.3

(2.3 – 4.4)

73.0

6.4

(5.1 – 8.0)

0.5

(0.4 – 0.7) §

0.72

(0.63 – 0.82)

Other surgical

28

2.9

(2.0 – 4.2)

26.4

2.7

(1.8 – 4.0)

1.1

(0.7 – 1.5)

0.85

(0.77 – 0.93)

Medical

64

7.8

(6.1 – 9.9)

87.0

10.6

(8.6 – 12.9)

0.7

(0.6 – 0.9) *

0.76

(0.69 – 0.82)

Year

2009

48

4.7

(3.5 - 6.2)

69.1

6.7

(5.3 - 8.5)

0.7

(0.5 - 0.9) #

0.81

(0.74 - 0.88)

2010

47

4.4

(3.3 - 5.8)

65.3

6.1

(4.7 - 7.7)

0.8

(0.5 - 0.9) *

0.82

(0.76 - 0.88)

2011

34

4.1

(2.9 - 5.7)

51.9

6.3

(4.8 - 8.2)

0.7

(0.4 - 0.9) *

0.73

(0.63 - 0.80)

Age class

Newborn (0-7d)

26

10.4

(6.9 - 14.8)

20.3

8.0

(4.9 - 12.0)

1.3

(0.8 - 1.9)

0.74

(0.66 - 0.83)

Neonate (8-30d)

11

6.3

(3.2 - 11.0)

14.1

8.0

(4.4 - 13.1)

0.8

(0.4 - 1.4)

0.79

(0.66 - 0.92)

Infant (1-12 m)

31

3.8

(2.6 - 5.4)

49.7

6.1

(4.6 - 8.0)

0.6

(0.4 - 0.9) #

0.69

(0.58 - 0.80)

Preschool (1-5y)

26

2.8

(1.9 - 4.1)

55.3

6.0

(4.5 - 7.7)

0.5

(0.3 - 0.7) §

0.84

(0.74 - 0.93)

School (6-12y)

15

3.5

(2.0 - 5.6)

26.8

6.2

(4.1 - 8.9)

0.6

(0.3 - 0.9) *

0.84

(0.76 - 0.92)

Adolescent (13-16y)

20

6.2

(3.8 - 9.4)

20.2

6.2

(3.8 - 9.4)

1.0

(0.6 - 1.5)

0.87

(0.79 - 0.95)

Total

129

4.4

(3.7 - 5.2)

186.4

6.4

(5.5 - 7.3)

0.7

(0.6 - 0.8) §

0.79

(0.75 - 0.83)

  1. *: observed versus expected deaths; p < 0.05.
  2. #: observed versus expected deaths; p < 0.01.
  3. §: observed versus expected deaths; p < 0.001.
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