Content-based validity evidence of the Acute Voice Fatigue Self-Perception Scale (AFA-Voz Scale).

Only five people judged the items, and all five were voice specialists with more than a decade of experience. The people who would actually fill the scale in were never consulted, so the paper cannot say whether a teacher or a singer reads the questions the same way the experts did. This paper covers content validity only. Reliability, internal structure, and agreement with other measures have not been examined, so there is no evidence yet about how the scale behaves in real use. The instrument has not been applied to anyone. The paper reports no scores from voice users and no comparison with the Vocal Fatigue Index or any other tool.

The work was funded by CNPq, Brazil's National Council for Scientific and Technological Development, through a postdoctoral fellowship under call number 49/2024. The funding and conflicts of interest section as supplied reports this funding only and names no competing interests.

Do not treat this as a validated questionnaire you can hand to a patient. The only evidence in the paper is that five expert judges agreed the items were relevant. No voice user has filled it in, and its reliability and its agreement with existing tools have not been tested, so the authors themselves say the scale is not ready for clinical use.