Table 1

The factors affecting the recruitment and randomisation process  

Participant recruitmentContact between participant and facilitator
OngoingOne-off contact (at facilitation)
Area/location not restrictedMODEL B
  • Randomise facilitators and participants

  • Intervention facilitators only to be trained

MODEL A
  • Randomise facilitators and participants

  • Intervention facilitators only to be trained

Within a specific geographical (or other prespecified) areaMODEL C
  • Train intervention facilitators only

  • Randomise facilitators only

  • Participants within each area allocated to facilitator (not randomised)

MODEL D
  • Train all facilitators

  • Randomise participants