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Table 3 Predictive Value of PTSD Diagnosis by the Number of Trauma Screening Items Endorsed (n = 88).

From: Brief screening for co-occurring disorders among women entering substance abuse treatment

  

Dx Pos.

Dx Neg.

Sensitivity (95% CI)

Specificity (95% CI)

Pred. Value Pos. (95% CI)

Pred. Value Neg. (95% CI)

C-Statistic1

Fisher's Exact P-value

4 PTSD Items Endorsed

Pos.

45

14

78% (67% – 88%)

53% (35% – 71%)

76% (65% – 87%)

55% (37% – 73%)

0.66

.0046

 

Neg.

13

16

      

5 PTSD Items Endorsed

Pos.

39

10

67% (55% – 79%)

67% (50% – 84%)

80% (68% – 91%)

51% (36% – 67%)

0.67

.0033

 

Neg.

19

20

      

6 PTSD Items Endorsed

Pos.

28

3

48% (35% – 61%)

90% (79% – 100%)

90% (80% – 100%)

47% (34% – 60%)

0.69

<.001

 

Neg.

30

27

      
  1. Note: 1The c-statistic is the area under the Receiver Operating Characteristic (ROC) curve, which measures test performance.
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Substance Abuse Treatment, Prevention, and Policy

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