Turkish Adaptation Study of the Generic Functional Index

The translation process will follow a specific protocol in accordance with the guidelines. It will include two independent forward translations and one back-translation, conducted after obtaining written permission from the original authors. Discrepancies between translations will be reviewed by an expert committee to resolve terminological and cultural differences. The process will ensure conceptual and cultural equivalence between the original English version and the Turkish version. The final version of the questionnaire will be adapted to the target population and finalized in consultation with the original authors.

Content validity will be calculated with the Content Validity Index, which is a result of expert opinions in terms of clarity, difficulty, and suitability of the Turkish version of the Generic Functional Index.

The internal consistency of the items will be tested with Cronbach alpha. Test-retest reliability will be tested with intraclass correlation coefficient.