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Moreover, an immunologist was also invited to review the questions for accuracy and errors, as well as to ensure the content validity.
The values computed for the content validity as suggetsed by Rusell were high, ranging from 71.6% to 81.6%.
The evidence gained in this study provided support for the content validity of the PSS for use as clinical trial endpoint among patients with plaque psoriasis.
Sims and Liu (2013) provided support for the content validity and concurrent validity of the EPE.
Qualitative methods, in particular focus groups/individual interviews and cognitive interviewing techniques, have emerged as the standard methodology for supporting the content validity for new or existing PRO instruments [ 6- 10] and have served as the foundation for previous PedsQL™ Disease-Specific Modules [ 11- 18].
Such factors would be a concern for regulatory agencies such as the FDA and may impact on the content validity and responsiveness of the instrument [ 13].
This work aimed to evaluate the content validity of the asthma symptom diary (ASD) for use as an efficacy endpoint in asthma clinical trials to support labelling claims.
Content validity was tested with the content validity index (CVI).
Study 1 appraised content validity using five sport scientists as judges to quantify the quality of the adaptation for each item; then the Content Validity Coefficient was calculated.
For the quantitative assessment, the Content Validity Ratio (CVR) and Content Validity Index (CVI) were determined.
This procedure ensured the content validity for the measurement items (Straub et al. 2004).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com