Construct Validity of the Brazilian Portuguese Version of the Thyroidectomy-Related Voice and Symptom Questionnaire (BR-PT-TVSQ).

The sample was mostly female and mostly from the Southeast region, so it may not represent men or all regions. Data came from hospital records, telephone calls and an online form, so responses may not have been collected in the same way for everyone. The study did not follow people over time, so it cannot show how scores change after treatment or surgery. Other measurement properties, such as test-retest reliability, responsiveness and measurement invariance, were not tested. The final model required outlier removal and still failed an overall fit test. The throat and neck/chest domains did not separate clearly, so sub-scores for those domains are less secure.

CAPES in Brazil funded part of the work. The authors declared no conflicts of interest.

Do not read the new domain structure as proof that the questionnaire is fully validated or that throat and neck/chest sub-scores are separate. The throat and neck/chest domains did not separate clearly, and responsiveness, test-retest reliability and measurement invariance were not tested.