Table 1.

PPI contributor and researcher questionnaires

PPI contributor questions	Researcher questions
Why do you think it is important that the group was involved?	Why do/did you think it is important that the group was involved?
	What do/did you see as the group’s purpose in the study?
What do you think has been the most important contribution made by: a. The group? b. By you?	What do you think has been the most important contribution made by the group?
What other contributions have been made?	In your opinion, what other contributions have been made?
What has given you the greatest satisfaction in working with the 3D study?	What has given you the greatest satisfaction in working with the group?
What barriers and facilitators have there been to you taking part in the PIP-CaRe group?	What (if anything) has been difficult or challenging in working with the group? a. For the trial? b. Personally?
	Where have you experienced unexpected benefits from working with the group? a. For the trial? b. Personally?
What lessons do you think could be learned from the experience? a. Personally? b. By researchers?	What lessons do you think could be learned from the experience? a. Personally? b. By researchers in general?
Anything else you would like to add?	Anything else you would like to add?