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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%