Content validity
To establish consensus for content validity beyond the standard error of
proportion (P < 0.05) the content validity index (CVI)
required was ≥0.70. In the first evaluation of ten experts our CVI was
0.80 for the initial 32 items while 26 of them scored an acceptable CVI
for inclusion. The remaining 6 items were discussed, missing concepts
identified and a final CVI employed to determine inclusion. Afterwards
it was applied to the pilot group(n=5). They reported all 32 items were
clear, understandable and applicable. Later, we started the study
process that we applied the questionnaire to 50 patients.