Table 1.
Internal consistency and test-retest reliability of the PTDS and its DSM-III-R precursor the PSS-SR
| Authors | Samples | Scales | Cronbach's alpha | Test-retest reliability |
| Foa, Riggs, Dancu, & Rothbaum (1993) [8] | 44 women (rape and other non-sexual attack) | Total score | .91 | .74 after one month (N = 29) |
| 5 – 6 weeks after the event | Reexperiencing | .78 | .66 | |
| Avoidance | .80 | .56 | ||
| Hyperarousal | .82 | .71 | ||
| Engelhard et al (2001) [7] | 113 women after miscarriage | Total score | .87 | |
| Stieglitz, Frommberger, Foa, & Berger (2001) [9] | 152 persons: | Total score | .85 and .86 | .60 after six months |
| 1. time point: a few days after accident | Reexperiencing | .75 and .82 | .39 | |
| Avoidance | .56 and .74 | .53 | ||
| 2 time point: 6 months later | Hyperarousal | .75 and .64 | .47 | |
| Foa, Cashman, Jaycox, & Perry (1997) [3] | 284 victims of various traumatic experiences | Total score | .92 | .83 (approx 2 weeks later) |
| Reexperiencing | .78 | .77 | ||
| Avoidance | .84 | .81 | ||
| Hyperarousal | .84 | .85 | ||
| Kappa = .74 for PTSD diagnosis |