CPTSD Is More Common Than PTSD: Serbian ITQ Validation Confirms the ICD-11 Distinction Matters Clinically
- Serbian ITQ clinical validation (n = 199 psychiatric patients, Institute of Mental Health Belgrade) — the first validation of the International Trauma Questionnaire in a Serbian clinical sample [EU/Serbia]
- CPTSD was more prevalent than PTSD: 25.7% vs. 18.7% — complex presentations dominate in clinical settings, confirming the diagnostic split's clinical relevance
- CFA supports both the six-factor and the second-order PTSD-DSO model (good fit); single-factor CPTSD model rejected — the ICD-11 two-construct architecture holds
- CPTSD associated with higher emotional dysregulation, dissociation, suicidality, and lower quality of life compared to PTSD — the diagnostic distinction predicts clinical severity
ICD-11 split PTSD into two diagnoses: PTSD (re-experiencing, avoidance, threat perception) and Complex PTSD (PTSD symptoms plus disturbances in self-organization — affect dysregulation, negative self-concept, relationship difficulties). The split was controversial. This Serbian validation study from the Institute of Mental Health in Belgrade provides the clinical data that justifies it: CPTSD is more common than PTSD in clinical populations, and the two conditions differ meaningfully on severity, comorbidity, and functional impairment.
The prevalence finding
In this clinical sample, 25.7% met criteria for CPTSD while only 18.7% met criteria for PTSD. This is consistent with international data: in clinical settings (as opposed to community samples), complex presentations are the norm, not the exception. The patients in a psychiatric institute in Belgrade — many with histories of war trauma, interpersonal violence, and childhood adversity — present predominantly with the disturbances in self-organization that define CPTSD.
The differential validity
PTSD symptoms (re-experiencing, avoidance, threat) were more strongly associated with trauma-related distress (measured by the IES-R). DSO symptoms (affect dysregulation, negative self-concept, relationship difficulties) were more strongly associated with depression, anxiety, and negative self-concept. This means the two clusters are not just different items on a checklist — they connect to different clinical domains.
The clinical implication: a patient scoring high on PTSD but low on DSO needs trauma-focused intervention (exposure, CPT, EMDR). A patient scoring high on DSO needs stabilization-focused work (emotion regulation, self-concept repair, relational work) before or alongside trauma processing.
For your practice
For clinicians using ICD-11 diagnostics: the ITQ is a 12-item, psychometrically valid instrument. Add it to your trauma assessment battery. For clinicians working in regions with war trauma, interpersonal violence, or childhood adversity (which describes most clinical populations): expect CPTSD to outnumber PTSD. Plan treatment sequences accordingly — phase-oriented work for CPTSD, direct trauma processing for PTSD. For Serbian-speaking clinicians: the validated Serbian ITQ is now available.
In a Belgrade psychiatric clinic, CPTSD outnumbered PTSD 25.7% to 18.7%. The ICD-11 split was not just taxonomic — it predicted who was sicker, more suicidal, and more functionally impaired.
Single-center clinical sample. Cross-sectional design. Self-report measures for ITQ and related constructs. The 199-patient sample limits subgroup analyses.