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Table 5 Summary of advantages and potential measurement errors of selected self-report instrument of PTSD symptoms

From: A systematic review of the relationship between severe maternal morbidity and post-traumatic stress disorder

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
  1. 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 [61] for TES-B. *The original study to test the PTCS [59] was unpublished and unobtainable.