Table 4

Sensitivity and specificity of CAM instrument with 95% CIs

SensitivitySpecificityPPVNPV
Acute change0.97 (0.93 to 0.99)0.79 (0.65 to 0.89)0.94 (0.90 to 0.96)0.87 (0.75 to 0.94)
Fluctuation0.88 (0.77 to 0.96)0.77 (0.70 to 0.83)0.53 (0.46 to 0.60)0.96 (0.92 to 0.98)
Inattention0.99 (0.94 to 1.00)0.65 (0.57 to 0.74)0.69 (0.57 to 0.69)0.99 (0.93 to 1.00)
Disorganisation0.68 (0.56 to 0.78)0.99 (0.95 to 1.00)0.96 (0.87 to 0.99)0.86 (0.82 to 0.89)
Altered LOC0.58 (0.37 to 0.77)0.90 (0.85 to 0.94)0.42 (0.30 to 0.55)0.94 (0.92 to 0.96)
Overall diagnosis*0.72 (0.60 to 0.81)0.99 (0.96 to 1.00)0.98 (0.89 to 1.00)0.88 (0.83 to 0.91)
  • *Per reference standard: 33% (3/9) observed cases with delirium.

  • LOC, level of consciousness; NPV, negative predictive value; PPV, positive predictive value.