General practice research. Problems and solutions in participant recruitment and retention.
BACKGROUND: Increasing interest in general practice research, especially postal surveys, has been met with decreasing response rates. Prospective, longitudinal surveys pose additional concerns for general practice researchers, one of the major problems being sample attrition after project commencement. OBJECTIVE: This article draws on the authors' experiences from seven studies conducted by them to identify useful strategies for researchers who need to recruit general practitioners and/or their patients, with particular reference to retaining participants across time. A list of issues, lessons learned and possible strategies was developed which, although not exhaustive, probably reflects those commonly encountered in many general practice studies. DISCUSSION: The issues identified here are not necessarily new, but it is useful to revisit such issues and to review and reiterate methods and processes, as even experienced researchers encounter problems from time to time. Studies involving prolonged participation especially, require diligent consideration of likely recruitment/retention problems.