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Table 3 Psychometric properties of the Arabic CAM-ICU according to mechanical ventilation status

From: Psychometric properties of the Arabic version of the confusion assessment method for the intensive care unit (CAM-ICU)

Property CAM-ICU by nurse
(n = 40)
CAM-ICU by intensivist (n = 39)
Mechanical ventilation
 Sensitivity (95%CI) 0.75 (0.58–0.92) 0.70 (0.51–0.88)
 Specificity (95%CI) 0.94 (0.82–1.0) 0.88 (0.71–1.0)
 Likelihood Ratio LR+ (95%CI) 12 (11.9–12.1) 5.57 (5.4–5.7)
 Likelihood Ratio LR- (95%CI) 0.27 (0.07–0.46) 0.35 (0.15–0.55)
 Positive predicted value (95%CI) 0.95 (0.85–1.0) 0.89 (0.74–1.0)
 Negative predicted value (95%CI) 0.71 (0.52–0.91) 0.67 (0.47–0.87)
 Pre-test probability 0.60 0.59
 Pre-test odds 1.5 1.44
 Post-test odds 18.0 8.0
 Post-test probability 0.95 0.89
 Delirium prevalence, CAM-ICU vs. psychiatrist clinical assessment 47.5% vs. 60% 46.2% vs. 59%
 Accuracy 82.5% 76.9%
No mechanical ventilation
 Sensitivity (95%CI) 0.73 (0.60–0.86) 0.50 (0.34–0.64)
 Specificity (95%CI) 1.0 (1.0–1.0) 0.96 (0.87–1.0)
 Likelihood Ratio LR+ (95%CI) Undefined* 10.8 (10.7–10.8)
 Likelihood Ratio LR- (95%CI) 0.27 (0.12–0.43) 0.54 (0.39–0.68)
 Positive predicted value (95%CI) 1.0 (1.0–1.0) 0.96 (0.87–1.0)
 Negative predicted value (95%CI) 0.67 (0.51–0.82) 0.48 (0.33–0.63)
 Pre-test probability 0.65 0.67
 Pre-test odds 1.83 2.05
 Post-test odds Undefined** 22.0
 Post-test probability Undefined*** 0.96
 Delirium prevalence, CAM-ICU vs. psychiatrist clinical assessment 47.1% vs. 64.7% 34.3% vs. 67.2%
 Accuracy 82.4% 64.2%
  1. CAM-ICU Confusion Assessment Method for the Intensive Care Unit, CI confidence interval * Specificity value is 1; ** Likelihood Ratio is undefined; *** Post-test odd is undefined