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. 2012 Nov 21;144(1):24–31. doi: 10.1378/chest.12-0908

Table 1.

—Sensitivities, Specificities, Predictive Values, Likelihood Ratios, and Efficiencies for IES-R Thresholds Corresponding to Full or Partial PTSDa

IES-Rb Sensitivity Specificity PPV NPV LR+ LR− Efficiency
DSM-IV PTSD (n = 8), AUC 95%, 95% CI, 88%-100%
1.0 100 71 35 100 3.5 0.0 75
1.1 100 75 38 100 4.0 0.0 78
1.2 100 77 40 100 4.3 0.0 80
1.4 100 83 47 100 5.8 0.0 85
1.6 100 85 50 100 6.5 0.0 87
1.8 75 86 46 96 5.6 0.3 85
2.0 75 92 60 96 9.8 0.3 90
Partial PTSDc (1), n = 12, AUC 97%, 95% CI, 92%-100%
1.0 100 77 52 100 4.4 0.0 82
1.1 100 81 57 100 5.3 0.0 85
1.2 100 83 60 100 6.0 0.0 87
1.4 92 88 65 98 7.3 0.1 83
1.6 92 90 69 98 8.8 0.1 90
1.8 75 92 69 94 9.0 0.3 88
2.0 66 96 80 92 16 0.4 90
Partial PTSD (2), n = 13, AUC 95%, 95% CI, 89%-100%
1.0 92 76 52 97 3.9 0.1 80
1.1 92 81 57 97 4.8 0.1 83
1.2 92 83 60 98 5.4 0.1 85
1.4 85 87 65 95 6.6 0.2 87
1.6 85 89 69 95 8.0 0.2 88
1.8 69 91 69 91 8.1 0.3 87
2.0 66 96 80 92 16 0.4 90
Partial PTSD (3), n = 15, AUC 96%, 95% CI, 91%-100%
1.0 100 82 65 100 5.6 0.0 87
1.1 93 84 67 97 6.0 0.1 87
1.2 93 87 70 98 7.0 0.1 88
1.4 87 91 76 95 9.8 0.2 90
1.6 80 91 75 93 9.0 0.2 88
1.8 67 93 77 89 10 0.4 87
2.0 53 96 80 86 12 0.5 85

Data given as % unless otherwise indicated. AUC = area under the receiver operating characteristics curve; DSM = Diagnostic and Statistical Manual of Mental Disorders; IES-R = Impact of Event Scale-Revised; LR− = likelihood ratio of a negative test result; LR+ = likelihood ratio of a positive test result; NPV = negative predictive value; PPV = positive predictive value; PTSD = posttraumatic stress disorder.

a

Assessed using the Clinician-Administered PTSD Scale.

b

IES-R total score (mean of all items).

c

Partial PTSD definitions: (1) symptoms met the DSM-IV B criterion (reexperiencing), as well as either the C (avoidance/numbing) or D (hyperarousal) criterion16; (2) symptoms met the B criterion, as well as one or more C and D symptom criteria25; (3) symptoms met at least two of three B, C, and D criteria.35