Data collection
UTIs, UCDs
MSU
An interview topic guide was developed, taking into account the available literature, which covered issues of interest relating to the UCDs and the women’s wider experiences of providing urine samples at times of suspected UTIs, such as their usual methods of collecting urine, their awareness of the need for MSU sampling, and their awareness of how samples could be contaminated. The topic guide was modified as the study progressed (see Supplementary Information S1). Two experienced female qualitative researchers (a health services researcher and a social sciences researcher, the first two authors) carried out the interviews between December 2016 and March 2018, across the time period when women were being recruited to the RCT. They regularly discussed the interviews to ensure consistency. Data collection finished when the researchers were satisfied that no new issues were emerging from the interviews and agreed that there was the necessary understanding of the emerging categories and themes. The average length of the interviews was 30 min.