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Table 2 Psychometric properties of the Arabic CAM-ICU according to age

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 = 62)
CAM-ICU by intensivist
(n = 62)
Age ≥ 65 years
 Sensitivity (95%CI) 0.79 (0.67–0.91) 0.65 (0.51–0.79)
 Specificity (95%CI) 0.95 (0.85–1.0) 0.90 (0.76–1.0)
 Likelihood Ratio LR+ (95%CI) 15.0 (15.0–15.1) 6.2 (6.1–6.3)
 Likelihood Ratio LR- (95%CI) 0.22 (0.04–0.40) 0.39 (0.22–0.56)
 Positive predicted value (95%CI) 0.97 (0.92–1.0) 0.93 (0.84–1.0)
 Negative predicted value (95%CI) 0.67 (0.49–0.84) 0.53 (0.36–0.70)
 Pre-test probability 0.69 0.69
 Pre-test odds 2.26 2.26
 Post-test odds 34.00 14
 Post-test probability 0.97 0.93
 Delirium prevalence, CAM-ICU vs. psychiatrist clinical assessment 56.5% vs. 69.4% 48.4% vs. 69.4%
 Accuracy 83.9% 72.6%
Age < 65 years
 Sensitivity (95%CI) 0.64 (0.45–0.83) 0.40 (0.21–0.59)
 Specificity (95%CI) 1.0 (1.0–1.0) 0.95 (0.85–1.0)
 Likelihood Ratio LR+ (95%CI) Undefined* 7.6 (7.4–7.8)
 Likelihood Ratio LR- (95%CI) 0.36 (0.20–0.52) 0.63 (0.46–0.80)
 Positive predicted value (95%CI) 1.0 (1.0–1.0) 0.91 (0.74–1.1)
 Negative predicted value (95%CI) 0.70 (0.54–0.86) 0.55 (0.38–0.72)
 Pre-test probability 0.54 0.57
 Pre-test odds 1.19 1.32
 Post-test odds Undefined** 10
 Post-test probability Undefined*** 0.91
 Delirium prevalence, CAM-ICU vs. psychiatrist clinical assessment 34.8% vs. 54.4% 25% vs. 56.8%
 Accuracy 80.4% 63.6%
  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