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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.