Personal demographic data: including the subject’s gender,age, occupation, education, marriage status, religion, main caregiver and the last blood test including blood urine nitrogen (BUN) and creatinine
Scale of knowledge:The scale mainly applied a dichotomy response (e.g. right/wrong), but to prevent patient guessing, the researchers added the choice of ‘I don’t know’ as well. There were 20 questions in total with a total possible score ranging from 0–20. The scale content validity index (CVI) was measured at 0.93. The Kuder-Richardson 20 (KR-20)
for the preresearch was 0.76, and the intraclass correlation
ICC) was also 0ฦ76 at a one-month retest.