Krakow 2001.
| Methods | Randomised controlled trial | |
| Participants | 168 female sexual assault survivors. 95% DSM‐IIIR PTSD in the USA | |
| Interventions | 2 x 3‐hour and 1 x 1‐hour sessions of group imagery rehearsal (n = 88) versus waiting list (n = 80) | |
| Outcomes | PSS | |
| Notes | Therapist credentials/experience is not reported. It is unclear whether or not treatment adherence was assessed. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Quote: "To mask treatment assignment, patients mailed back a postcard after intake to complete entry into the protocol The postcard’s time and date were logged into a computer and entered into a previously generated list of numbers that randomly assigned participants to treatment and control groups. All numbers and group assignments were generated at the start of the protocol". Comment: The method of sequence generation was not reported |
| Allocation concealment (selection bias) | Low risk | Quote: "To mask treatment assignment, patients mailed back a postcard after intake to complete entry into the protocol The postcard’s time and date were logged into a computer and entered into a previously generated list of numbers that randomly assigned participants to treatment and control groups. All numbers and group assignments were generated at the start of the protocol". |
| Incomplete outcome data (attrition bias) All outcomes | Low risk | Comment: ITT analyses were performed. 20 withdrew from waitlist and 22 from the treatment group. Reasons for attrition are not fully reported. |
| Selective reporting (reporting bias) | Low risk | Comment: All specified outcomes were reported |
| Other bias | High risk | Comment: The issue of researcher allegiance cannot be ruled out. Therapist credentials/experience is not reported. It is unclear whether or not treatment adherence was assessed. |
| Blinding of participants and personnel (performance bias) All outcomes | High risk | Comment: Participants were aware of their allocation. |
| Blinding of outcome assessment (detection bias) All outcomes | Low risk | Quote "To limit external bias, blinding occurred at 3 points of data collection: (1) at intake, group assignment had not been established; (2) at 3‐month follow‐up, questionnaires were completed through the mail; and (3) at 6‐month follow‐up, interviewers were unaware of group status." |