Table 1.

Interview questions

1. General comprehension

• How do you understand the C-NoMAD survey purpose?

• Is there any item hard to understand? If there is, could you please tell me the reason and provide a better expression?

• How do you understand normalization?

2. Instruction comprehension

• How do you understand the meaning of option A and option B?

• Please explain the differences among “strongly disagree” “disagree” “neutral” “agree” “strongly agree”

• Please explain how do you understand “not relevant to my role” “not relevant in this stage” “not relevant to the intervention”?

3. Item comprehension

• How do you understand the difference of these three questions in Part B?

• Please see the item #, how do you understand the meaning of the item # “XXX”, which option do you choose? Why?