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Table 1 Summary of potential recruitment interventions provided to participants before interview

From: Trials within trials? Researcher, funder and ethical perspectives on the practicality and acceptability of nesting trials of recruitment methods in existing primary care trials

  Unit of Allocation1 Recruitment Stage2 Type of Intervention
Financial incentives to patients and professionals (e.g. payment for recruitment, lottery etc) Trial, cluster, individual 1, 2, 3, 4 Incentives
Attachment of additional, dedicated research nurses for sessions in participating centres Trial 2, 3, 4 Resources
Showing a DVD of previous trial participants discussing their experiences of being involved in research. Cluster, individual 1, 2, 3 Attitudes of patients and professionals
Mass media approaches to change attitudes to trials among patients Trial 3, 4 Attitudes of patients
Educational incentives to clinicians. e.g. seminar on trials and research methods Trial, cluster 1, 2 Attitudes of professionals
Training for clinicians in seeking consent for trials Trial, cluster 2 Attitudes of professionals
Option to refer patients to a dedicated research centre or hub Trial, cluster 2 Incentives for professionals
Support for investigators on project management and monitoring approaches, with in-built contingency planning Trial Trial planning Advice and support for trial recruitment
  1. 1 Unit of allocation for the recruitment intervention: (Trial, Cluster within a trial, Individual patient)
  2. 2 Recruitment stage that intervention is designed to improve:
  3. Trial planning and organization;
  4. Stage 1: Professional consent to participate in trial;
  5. Stage 2: Professional recruitment of patients;
  6. Stage 3: Patient consent to participate in trial;
  7. Stage 4: Retention of patient in trial