September 10, 2025European Journal of Translational MyologyOpen Access

Validation of the Bulgarian versions of the EORTC QLQ-C30 and FACT-G: reliability, construct validity, and agreement in cancer survivors

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The Bulgarian versions of the EORTC QLQ-C30 and FACT-G have demonstrated excellent internal consistency, with Cronbach’s α ranging from 0.88 to 0.95.
Test-retest reliability for the instruments was high, displaying stability with ICC values between 0.75 and 0.89 across a 14-day interval.
Strong correlations for construct validity were observed, with item-scale correlations ranging from 0.62 to 0.81, confirming the adequacy of both measures.
Agreement analysis revealed a mean difference of 23.20, with acceptable limits of agreement, suggesting reliable tracking of hrqol in cancer survivors.

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Implication

Cross-sectional study shows high reliability and construct validity for EORTC QLQ-C30 and FACT-G in cancer survivors, indicating they are suitable for clinical use.

Cite This Study

Peykov et al. (2025) studied this question.

synapsesocial.com/papers/68c23b4ab210217d64783a8f https://doi.org/10.4081/ejtm.2025.14121

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Implication

Cross-sectional study shows high reliability and construct validity for EORTC QLQ-C30 and FACT-G in cancer survivors, indicating they are suitable for clinical use.

Validation of the Bulgarian versions of the EORTC QLQ-C30 and FACT-G: reliability, construct validity, and agreement in cancer survivors

Key Points

Discussion

Implication

Cite This Study

Validation of the Bulgarian versions of the EORTC QLQ-C30 and FACT-G: reliability, construct validity, and agreement in cancer survivors

Key Points

Discussion

Implication

Cite This Study

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