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