Table 3 |
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Predictive Value of PTSD Diagnosis by the Number of Trauma Screening Items Endorsed (n = 88). |
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|
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 |
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|
|
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|
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 |
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|
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 |
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|
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 |
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|
|
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|
Note: 1The c-statistic is the area under the Receiver Operating Characteristic (ROC) curve, which measures test performance. |
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|
Lincoln et al. Substance Abuse Treatment, Prevention, and Policy 2006 1:26 doi:10.1186/1747-597X-1-26 |
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