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