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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.