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Psychometric validation of the Turkish Illness Identity Questionnaire (IIQ-TR)
Ayşe Dilara Sal1, Kadriye Belgin Demirus2, Fazıl Serdar Gürel3
1National Defence University, Educational Sciences, Ankara, Turkiye.
Disability and Rehabilitation
|July 5, 2026
Summary
The Turkish version of the Illness Identity Questionnaire (IIQ) is a valid and reliable tool for assessing how chronic illness integrates into identity. This validation supports its use in Turkish populations for better patient understanding.
Area of Science:
- Psychology
- Health Psychology
- Psychometrics
Background:
- Illness identity significantly impacts psychological well-being and life satisfaction in individuals with chronic conditions.
- The Illness Identity Questionnaire (IIQ) is a key instrument for measuring the integration of illness into one's self-concept.
- Cultural adaptation and validation are crucial for ensuring the accurate application of psychological instruments in diverse populations.
Purpose of the Study:
- To culturally adapt and psychometrically validate the Turkish version of the Illness Identity Questionnaire (IIQ).
- To assess the reliability and validity of the Turkish IIQ for measuring illness identity in young adults with chronic illness.
Main Methods:
- The study involved a sample of 166 young adults with chronic illness.
- The Illness Identity Questionnaire (IIQ) underwent forward-backward translation and expert review for content and language validity.
- Confirmatory factor analysis (CFA), convergent validity, and reliability analyses (Cronbach's alpha) were conducted.
Main Results:
- Confirmatory factor analysis supported a four-factor structure (engulfment, rejection, acceptance, enrichment) with good model fit.
- Significant correlations were found between illness identity dimensions, depression, and life satisfaction, aligning with theoretical expectations.
- Reliability analyses indicated good internal consistency (Cronbach's alpha: 0.719–0.907) and item homogeneity.
Conclusions:
- The Turkish version of the Illness Identity Questionnaire (IIQ) possesses acceptable psychometric properties.
- The validated Turkish IIQ is a reliable and suitable instrument for assessing illness identity in Turkish-speaking individuals with chronic illness.
- This validated tool can aid in understanding the psychological impact of chronic illness and inform culturally sensitive interventions.
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