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. Author manuscript; available in PMC: 2007 Feb 1.
Published in final edited form as: J Trauma Stress. 2006 Feb;19(1):119–128. doi: 10.1002/jts.20106

Table 5.

Impact of Event Scale (IES) classification analysis employing a cut off score of 27.

CAPS PTSD Diagnosis
Present Absent Total
Positive 90 37 127
IES Negative 9 93 102
Total 99 130 229

Sensitivity = 91%

Specificity = 72%

Positive Predictive Power = 71%

Negative Predictive Power = 91%

False Positive Rate = 28%

False Negative Rate = 9%

Overall Correct Classification = 80%

Kappa = .60 (p < .001)