Temporal sequencing of symptom change in youth receiving treatment for posttraumatic stress disorder and substance use: secondary findings from a randomised controlled trial.
Olivia Dobson, Natalie Peach, Joanne Cassar et al.
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In 30 seconds
This secondary analysis of a randomised controlled trial examined symptom change and its timing in 55 youth aged 13–25 years with co-occurring PTSD and substance use disorders. Participants received integrated, exposure-based COPE-A or supportive person-centred counselling, with symptoms assessed at each session. COPE-A produced a greater reduction in total PTSD symptom severity during treatment (β = -17.00, 95% CI -29.50 to -4.46). Substance use quantity and frequency did not differ between groups, and PTSD improvement was not associated with concurrent or later substance-use change.
Key findings
- COPE-A reduced total PTSD symptom severity more than supportive counselling (β = -17.00, 95% CI -29.50 to -4.46).
- There were no between-group differences in substance-use quantity or frequency.
- PTSD symptom clusters improved concurrently, with no temporal relationships observed between PTSD and substance-use changes.
Why it matters
The findings add evidence about symptom trajectories during treatment for youth with co-occurring PTSD and substance use disorders. PTSD improvement with an exposure-based integrated intervention did not coincide with, or predict, substance-use improvement, suggesting that these outcomes may follow distinct courses. This distinction is relevant when interpreting treatment response and considering how integrated care models address both conditions.
What to keep in mind
The analysis involved 55 participants, and the reported treatment-period findings do not establish longer-term outcomes.