Table 1 Participant eligibility criteria

Inclusion criteria

• 18 years of age or older

• Be referred to the study by the Psychiatric Outreach Team or by Ottawa Inner City Health

• Meet DSM-5 criteria for PTSD, as measured by the Mini-International Neuropsychiatric Interview (MINI)

• Be homeless or vulnerably housed at the time of their screening visit, as measured by the Housing Status Questionnaire

Exclusion criteria

• Unable to speak and understand English

• Unwilling to attend the Narrative Therapy session for a period of 6 weeks

• Unwilling to return to a designated therapy location to complete study follow-up appointments

• Presents to their study screening visit acutely intoxicated

• Be, in the opinion of the investigator, unlikely to commit to a 12-week study

• Poses a risk of harm to study staff or other clients