Validity
Content validity (CV) was applied to assess the validity of AGS-13. The assessment of the CV was done using two qualitative and quantitative methods. In the qualitative method, we sent the Persian version of the AGS-13 to 11 experts in the fields of instrumentation and psychometric measurement, community health nursing, and specialists in the field of psychology and oncology and received their opinions in terms of grammar, wording, item allocation, and scaling. In the quantitative method, CV was examined using Content Validity Ratio (CVR) and Content Validity Index (CVI) [