Table 2.

Diagnostic Test Characteristics of the 3D-CAM and CAM-ICU Compared to the Clinical Reference Standard Delirium Assessment

2a. Test Characteristics of the 3D-CAM
Delirium Diagnosis (− or +)	Reference Standard (+)	Reference Standard (−)	3D-CAM Totals
3D-CAM (+)	18	6*	24
3D-CAM (−)	1	76	77
Reference standard totals	19	82	101
Test characteristic (%)	Sensitivity = 18/19 (95 %)	Specificity = 76/82 (93 %)
95 % CI	[74 %,100 %]	[85 %, 97 %]
2b. Test Characteristics of the CAM-ICU
Delirium Diagnosis (− or +)	Reference Standard (+)	Reference Standard (−)	CAM-ICU Totals
CAM-ICU (+)	10	0	10
CAM-ICU (−)	9	82	91
Reference standard totals	19	82	101
Test characteristic (%)	Sensitivity = 10/19 (53 %)	Specificity = 82/82 (100 %)
95 % CI	[29 %,76 %]	[96 %,100 %]

CI confidence interval

*Of the six 3D-CAM false positives, four were judged to have subsyndromal delirium based on the reference standard assessment