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Table 1 Progression criteria to full trial

From: Testing the effectiveness of REACH Pregnancy Circles group antenatal care: protocol for a randomised controlled pilot trial

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Recruitment—numbers of available women in each catchment Within each catchment area, 60+ pregnant women with appropriate due dates Within each catchment area, 40–59 pregnant women with appropriate due dates Within the catchment area, less than 40 pregnant women with appropriate due dates
Recruitment—percentage who consent to randomisation More than 40% who are eligible consent to randomisation 20–40% who are eligible consent to randomisation Less than 20% who are eligible agree to randomisation
Uptake of group care model 8 or more of the 12 randomised take up the groups 6–7 of the 12 randomised take up the group Fewer than 6 of the 12 randomised take up the group
Retention in groups* 5 remain in the group for 6+ sessions 4–5 remain in the group for 6+ sessions Fewer than 4 women remain in the group for 6+ sessions
Follow-up response rate—self-complete outcomes questionnaire(s) 75% or greater response to follow-up 40–74% response to follow-up Less than 40% response to follow-up
  1. *Allowing for preterm births and moving out of the NHS Trust usual catchment area