Basoglu 2007.
| Methods | Randomised controlled trial | |
| Participants | 31 earthquake survivors in Turkey with DSM‐IV PTSD (27 women, 4 men) | |
| Interventions | Single session of CBT (n = 16) vs repeated assessments (n = 15) | |
| Outcomes | CAPS, FAQ, BDI, WSA, GIS‐S, GIS‐A | |
| Notes | Treatment was delivered by therapists who were experienced in delivering the intervention on the basis of having done so as part of earlier trials. | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Low risk | Quote "A computer‐generated sequence of random numbers that ensured equal cell sizes and did not lead to allocation of more than two consecutive cases to the same experimental condition was used in the randomization." |
| Allocation concealment (selection bias) | Low risk | Quote "Participants were enrolled by two independent assessors (psychologists) and randomizations was conducted by the second author, who did not participate in baseline assessments." |
| Incomplete outcome data (attrition bias) All outcomes | High risk | Comment: Participants who did not have at least one follow‐up after treatment were replaced. ITT analyses were performed after this point. One person dropped out of treatment group. No one dropped out from waitlist group. No reasons were given. |
| Selective reporting (reporting bias) | Low risk | Comment: All specified and expected outcomes appear to have been reported. |
| Other bias | High risk | Comment: Treatment adherence was not assessed, since the treatment was said to closely reflect the way treatment was delivered in routine fieldwork. Poor reporting of baseline characteristics. |
| 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 | High risk | Quote: "The assessors were blind as to the participants’ experimental condition at the week 4 and week 8 assessments." Test of blinding included. However, 6 cases were followed up by therapists due to an unexpected shortage of funding. |