Table 5.
Summary of advantages and potential measurement errors of selected self-report instrument of PTSD symptoms
| Tool | DTS | IES | PSS-SR | PTCS | SRIP | TES-B |
|---|---|---|---|---|---|---|
|
No. of items |
17 |
15 |
17 |
15 |
22 |
17 |
|
Response scale |
5 point Likert |
4 point Likert |
4-point Likert |
5-point Likert |
4 point Likert |
4 point Likert |
|
Validity |
|
|
|
|
|
|
|
- Sensitivity |
0.69 |
1.00 |
0.62 |
Not yet |
0.86 |
Not yet |
|
- Specificity |
0.95(cut-off of 40on sum score) |
0.78(cut-off of 19on sum score) |
1.00 |
established |
0.71 |
established |
|
Reliability |
|
|
|
|
|
|
|
- Internal consistency |
0.99 |
0.78 (intrusions)0.82 (avoidance) |
0.91 |
0.93 |
0.90-0.94 |
0.84 |
|
- Test-retest |
0.86 |
0.89 (intrusions) 0.79 (avoidance) |
0.74 |
-- |
0.60-0.97 |
-- |
|
Reporting period |
Past week |
Past week |
Past two weeks |
Not available |
Past four weeks |
Past four weeks |
|
Specify stressor of interest |
Yes |
Yes |
Yes |
Not available |
No |
Yes |
| DSM-IV criteria | B, C, D | B, C | B, C, D | Not available | B, C, D | A, B, C, D, E, F |
Note: DSM-IV criteria: A = Stressor, B = Intrusion/re-experience, C = Avoidance/numbing, D = Hyperarousal, E = Duration, F = Disability. Validity and reliability were obtained from Foa et al. [53] for the PSS-SR; Davidson et al. [54] for the DTS; and Horowitz et al. [58] and Wohlfarth et al. [62] for the IES and Stramrood et al. [61] for TES-B. *The original study to test the PTCS [59] was unpublished and unobtainable.