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Table 2 The discriminating ability of the admission Acute Physiology and Chronic Health Evaluation (APACHE) II model and the worst 24-hour APACHE II model to predict inhospital mortality in different diagnostic and patient subgroups

From: A comparison of admission and worst 24-hour Acute Physiology and Chronic Health Evaluation II scores in predicting hospital mortality: a retrospective cohort study

Different diagnostic and patient subgroups

Number of patients

Mean area under the ROC curve (%) (95% confidence interval)a

Standardised mortality ratio (95% confidence interval)

  

Admission model

Worst 24-hour model

Admission model

Worst 24-hour model

Sepsis, pneumonia, gastrointestinal perforation or obstruction

1,474

68.3 (65.4–71.3)

68.5 (65.6–71.4)

0.94 (0.90–0.98)

0.77 (0.75–0.80)

Intracranial, subdural or subarachnoid haemorrhage

851

79.5 (76.3–82.7)

80.4 (77.2–83.5)

1.29 (1.22–1.36)

1.03 (0.98–1.08)

Multiple trauma

1,299

87.0 (84.1–89.9)

87.3 (84.4–90.1)

1.73 (1.63–1.84)

1.24 (1.17–1.31)

Cardiac arrest (nonoperative or intraoperative)

395

73.9 (69.1–78.8)

73.9 (69.0–78.8)

0.92 (0.88–0.96)

0.82 (0.79–0.85)

Elective surgery (excluding cardiac surgery)

3,012

78.6 (74.8–82.4)

80.8 (77.3–84.4)

1.04 (1.00–1.09)

0.79 (0.76–0.83)

Aboriginal patients

863

77.8 (74.2–81.4)

78.8 (75.2–82.3)

1.02 (0.95–1.09)

0.82 (0.77–0.87)

Patients transferred from another hospital

1,127

79.4 (76.3–82.4)

80.4 (77.4–83.5)

0.87 (0.82–0.92)

0.71 (0.67–0.75)

Patients admitted between 1993 and early 1999

5,553

85.4 (84.0–86.7)

86.1 (84.8–87.4)

1.05 (1.01–1.09)

0.85 (0.82–0.88)

Patients admitted between early 1999 and 2003

5,554

83.3 (82.0–84.5)

84.1 (82.8–85.3)

1.09 (1.06–1.13)

0.88 (0.86–0.91)

Patients stayed in the ICU longer than 24 hours

8,461

80.4 (79.2–81.5)

81.2 (80.1–82.3)

0.99 (0.97–1.02)

0.79 (0.77–0.81)

Patients survived longer than 24 hours of hospitalisation

10,733

82.2 (81.1–83.2)

83.0 (82.0–84.0)

0.93 (0.91–0.95)

0.74 (0.73–0.76)

  1. aThere was no significant difference in the areas under the receiver operating characteristic (ROC) curves between the admission APACHE II model and the worst 24-hour APACHE II model (P = 1.00).