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August 22, 2026Journal of Psychopathology and Behavioral AssessmentOpen Access

Validation of the Polish Version of the International Adjustment Disorder Questionnaire (IADQ) in a Community Sample of Young Adults

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Authors

AWAnna WendołowskaKSKatarzyna Sitnik‐WarchulskaBIBernadetta Izydorczyk

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Overview

Psychometric validation study demonstrates high reliability and structural validity of the adjustment disorder questionnaire in young adults, indicating its utility for early clinical screening.

Key Points

  • To validate the Polish version of the International Adjustment Disorder Questionnaire (IADQ) and evaluate its psychometric properties and clinical utility in young adults.
  • Assessed a community sample of 2,418 young adults (aged 18–29) in Poland using the IADQ, Perceived Stress Scale (PSS-10), Mental Health Continuum–Short Form (MHC-SF), and Personality Inventory for ICD-11 (PiCD).
  • Evaluated the instrument via confirmatory factor analysis for a two-factor structure (Preoccupation and Failure to Adapt), measurement invariance across gender, internal consistency, and regression analyses.
  • Confirmatory factor analysis confirmed a two-factor model with excellent fit indices (CFI = 0.988, RMSEA = 0.080), gender invariance, and strong internal consistency (α = 0.92).
  • IADQ scores correlated positively with perceived stress (r = 0.60) and negative affect (r = 0.52), correlated negatively with well-being (r = −0.30), and identified probable adjustment disorder in 34.7% of participants based on ICD-11 criteria.

Cite This Study

Wendołowska et al. (2026) studied this question.

synapsesocial.com/papers/6a895eeeca7ade938187d19dhttps://doi.org/10.1007/s10862-026-10312-5
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