Table 2.

Examples of the analysis process of the 23 transcribed telephone interviews regarding receiving an invitation to the randomized controlled trial

Interview	Original statement	Subcategory	Main category
16	Mm, they asked when I got in there [labour ward], if I wanted to participate in this study, and I had heard about it before also at the midwife, that this study existed.	Where did the woman get information?	Timing of trial information and understanding
7	I think it is always important to contribute to everything like that [the RCT], which can improve care and research and everything like that. Because I know it is necessary. I said yes to participate pretty quickly, but then they said: “Yes, but you don’t have to decide now, you have to think.” “Yes, but I don’t have to think about it, it’s okay, I can be part of it.”	Wants to contribute to research	Reasons to consent or decline
9	I might not have conceived of such a thing, with a vacuum-assisted delivery. I probably didn’t even want to think about it, so that was probably when I got [a feeling] – yeah, that could happen.	Complications became actual and real	Thoughts evoked regarding childbirth