Exploring outcomes of a self-guided online course for adults with posttraumatic stress symptoms

Posttraumatic stress and psychological functioning among trauma-exposed adults receiving immediate or delayed access to a self-led online cognitive processing therapy workbook

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN53622359

Enrollment

182

Registered

2026-07-22

Start date

2025-02-20

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Posttraumatic stress symptoms following exposure to a DSM-5 Criterion A traumatic event Mental and Behavioural Disorders

Interventions

Eligible participants are allocated to either immediate access to a 12-week self-led online course or a 12-week delayed-access waitlist condition. The online course uses exact content from the Guilfor

Eligibility

Sex/Gender

All

Age

18 Years to 120 Years

Inclusion criteria

Inclusion criteria: 1. Ages 18+years 2. Residing in the United States 3. Able to read and complete study procedures in English 4. Exposure to at least one DSM-5-TR Criterion A traumatic event, assessed using the Life Events Checklist for DSM-5 (LEC-5) 5. Clinically Elevated PTSD symptoms, defined as a PTSD Checklist for DSM-5 score of 31 or higher 6. Able to access and complete the study procedures and intervention online 7. Not currently receiving psychotherapy or other psychological treatment

Exclusion criteria

Exclusion criteria: 1. Younger than 18 years old 2. Not residing in the United States 3. Self-reported low proficiency in English reading and/or writing 4. No qualifying DSM-5 Criterion A traumatic event 5. PTSD Checklist for DSM-5 score below 31 6. Currently receiving psychotherapy or psychological treatment for PTSD 7. Recent active suicidality (self-reported) 8. Change in psychotropic medication during the preceding 6 weeks, or change in medication during the study 9. Imminent risk of harm to self or others (self-reported) 10. Unable to complete the online study procedures as outline in the informed consent (e.g., completion of the intervention)

Design outcomes

Primary

Measure	Time frame
PTSD symptom severity measured using PTSD Checklist for DSM-5 total score at baseline, weekly during the 12-week intervention or waitlist period, and post-treatment. The primary comparison is change from baseline to the end of the 12-week intervention or waitlist period.	—

Secondary

Measure	Time frame
Overall psychological functioning measured using Outcome Questionnaire-45 total score at baseline and pre-treatment, post-treatment	—

Countries

United States of America

Contacts

Public ContactMelissa Jones

cpt-study@byu.edu+1 (801) 422-4287

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Aug 10, 2026