1. Follow-up interviews (in-person or telephone) |
– Emphasize the value of participant’s contribution at each interview and review the study purpose |
– Provide breaks during lengthier interviews |
2. Participant tracking and interview scheduling |
– Maintain the same field interviewer |
– Text reminders 1 week and 24 h prior to each interview |
– Attempt different modes/times/types of contact and alternative contacts (partner/friends/family) |
– Reminder of ongoing study eligibility even if previous interviews are missed |
– Offer flexibility in interview location and time and accommodate requests for rescheduling |
– Encourage participants to update team with changes in personal information |
3. Specific tracking protocols |
– Identify new approaches, vary contact type and frequency, send re-engagement letter |
4. Study team support |
– Review progress reports (completed or missed interviews, requests to withdraw) |
– Frequent field interviewer meetings and retention training |