Trial Retention

Non-completion of trial outcome data collection is shaped by health, burden, life context, culture, self-perception, staff relationships and expectations. Retention is interpreted as a continuing process rather than a one-time decision. Participants may intend to continue yet still fail to complete follow-up assessments. Poor retention can produce missing outcome data and weaken trial findings. The synthesis focuses on participant non-completion of trial processes related to outcome data collection rather than broader adherence problems.