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