Table 3.

Reasons for declining to complete the questionnaire (N=140).

Reasons	Telephone survey or refusal, n (%)
Unknown	18 (12.9)
I do not want to be confronted with the past	37 (26.4)
I have already participated in many studies	34 (24.3)
I think the questionnaire is too long	15 (10.7)
I have no time to fill out the questionnaire	11 (7.9)
I have no interest in this study	11 (7.9)
I have had bad experiences in the past with research/care	6 (4.3)
I am currently unable to fill out the questionnaire	5 (3.6)
The answers to the questions are already available at the clinic	4 (2.9)
I am unable to answer the questions due to a mental handicap	4 (2.9)
I find the information about the study unclear	0 (0.0)