Table 1.

Details of the study meetings and interviews

Project	Meeting type	Meeting purpose	Setting	Meeting attendees	Public collaborators' previous involvement in research	Interviewees from the meeting
Antenatal Aim: To develop an intervention for pregnant women	First of a series of PPI advisory group meetings to inform the study.	To discuss findings from the study's literature review.	Community centre playroom.	Two researchers, one PPI facilitator (author of this paper), six mothers who had recently given birth, with babies and toddlers present.	All were new to patient involvement. They volunteered after researchers approached an existing toddler‐parent group.	Two public collaborators and two researchers.
Data set Aim: To develop a new prognostic model for risk estimation	First research project team meeting, held monthly.	To discuss and make decisions on the study protocol in response to peer review.	University meeting room, round‐table set‐up.	Eight researchers, one PPI facilitator (author of this paper), two public collaborators.	Previous involvement in research or NHS committees.	Two public collaborators and one researcher.
Screening Health Technology Assessment of a screening interven‐tion	First of three one‐off workshops with public collaborators. All workshops followed the same format and purpose, but with different public collaborators.	To identify relevant outcomes for the protocol and discuss the relevance of health inequalities to screening uptake.	University meeting room, tables set up for three small groups.	Two researchers from the project team, one researcher observing the meeting, one PPI facilitator, nine members of the public. Both the observing researcher and the PPI facilitator are authors of this paper.	Two were new to involvement, two had limited experience of it, and five had previous experience of being involved in research.	Two public collaborators and one researcher.

Abbreviations: NHS, National Health Service; PPI, patient and public involvement.