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Table 7 Sensitivities and specificities for a subset of threshold values of the NEECHAM total score (n = 54 patients, 194 test occasions)

From: Psychometric properties of the Flemish translation of the NEECHAM Confusion Scale

 

CAM algorithm

 

NEECHAM total score

Delirious N

Not delirious n

Total N

≤ 24

7

27

34

≥ 25

6

154

160

Total

13

181

194

Sensitivity [(7/13) × 100] = 53.8%; Specificity [(154/181) × 100] = 85.1%; Predictive value of a positive test [(7/34 × 100] = 20.6%; Predictive value of a negative test [(154/160) × 100] = 96.3%; Accuracy [(7+154/7+27+6+154) × 100] = 83.0%

≤ 25

8

31

39

≥ 26

5

150

155

Total

13

181

194

Sensitivity = 61.5%; Specificity = 82.9%; Predictive value of a positive test = 20.5%; Predictive value of a negative test = 96.8%; Accuracy = 81.4%

≤ 26

9

50

59

≥ 27

4

131

135

Total

13

181

194

Sensitivity = 69.2%; Specificity = 72.4%; Predictive value of a positive test = 15.2%; Predictive value of a negative test = 97.0%; Accuracy = 72.2%

≤ 27

10

64

74

≥ 28

3

117

120

Total

13

181

194

Sensitivity = 76.9%; Specificity = 64.6%; Predictive value of a positive test = 13.5%; Predictive value of a negative test = 97.5%; Accuracy = 65.5%

≤ 28

10

84

94

≥ 29

3

97

100

Total

13

181

194

Sensitivity = 76.9%; Specificity = 53.6%; Predictive value of a positive test = 10.6%; Predictive value of a negative test = 97.0%; Accuracy = 55.2%

≤ 29

11

118

129

30

2

63

65

Total

13

181

194

Sensitivity = 84.6%; Specificity = 34.8%; Predictive value of a positive test = 8.5%; Predictive value of a negative test = 96.9%; Accuracy = 38.1%