Phase-based versus non-phase-based psychological interventions for complex PTSD: a systematic review and meta-analysis.

In 30 seconds

This systematic review and meta-analysis compared phase-based psychological interventions with non-phase-based approaches for people with clinically significant complex PTSD symptoms, or PTSD with at least two disturbances-in-self-organization clusters. Across most outcomes, the review found no significant differences between phase-based and non-phase-based interventions, or between exposure and non-exposure approaches. Multi-phase interventions showed greater effects on PTSD symptoms, while phase-based, multi-phase, and exposure interventions showed greater improvement in affect regulation difficulties. The abstract reports no pooled effect sizes or other quantitative estimates.

Key findings

• Across most outcomes, phase-based and non-phase-based interventions did not differ significantly.
• Multi-phase interventions had superior effects on PTSD symptoms compared with single-phase interventions.
• Phase-based, multi-phase, and exposure interventions showed greater improvement in affect regulation difficulties than their respective comparators.

Why it matters

The findings inform the ongoing question of whether stabilization must precede trauma-memory exposure in treatment for complex PTSD. The lack of clear differences across most outcomes suggests that structured phase-based or exposure-based approaches are not uniformly superior, while the reported outcome-specific advantages indicate that intervention design may matter for particular symptoms.

What to keep in mind

The review was limited by the small number of available trials, assessment at a single time point, and heterogeneity in outcome measures, constraining subgroup comparisons and the precision of effect estimates.