Characteristics of participants who gave a full interview, consented to venous or DBS samples and provided a good DBS sample by mode of interview
In actual or realised mode, consent rates for biological sample collection were higher in the nurse mode (74%) than in those invited for self-collection (35%). Participants reported they were likely to take part again (likelihood of participating again score from 1 to 10: 8.8 ± 1.7) irrespective of whether they were seen by a nurse (8.8 ± 1.8) or not (8.9 ± 1.6).With the exception of age, there were no differences in the characteristics of those who consented to a DBS sample by nurse or self-collection (Table Participant characteristics of those who gave a full interview, consented to blood sample, and provided a good DBS sample by mode of interview/DBS sample collection.*